California’s STG tier classification sorts prison gangs into two levels that control how the state manages people validated as affiliates: Tier I covers the most organized prison-based gangs and can send a validated member straight into restrictive housing, while Tier II covers street gangs and regional groups whose validated affiliates generally stay in general population unless specific gang-related behavior is documented. The tier assigned to the group, and whether you are classified as a member or an associate within it, determines where you are housed, what privileges you keep, and how many years must pass before the label can come off.
What Tier I Covers
Tier I is reserved for groups CDCR considers the most severe security threat based on a documented history of violence and the ability to influence or control other gangs. The regulations describe Tier I groups as having “clandestine operations” and demonstrated influence over subordinate organizations.1California Department of Corrections and Rehabilitation. STG Tier Classification System – Adopted Regulations Groups historically designated as STG-I include the Aryan Brotherhood, Black Guerrilla Family, Mexican Mafia, Nuestra Familia, Northern Structure, Nazi Low Riders, and Texas Syndicate. What sets them apart from Tier II groups is organizational sophistication: centralized leadership, established chains of command, and the capacity to direct operations across the prison system.
Housing consequences differ sharply inside Tier I depending on whether you are classified as a member or an associate. A validated STG-I member can be placed directly into the Step Down Program and housed in a Security Housing Unit based solely on the validation, with no recent disciplinary violation required. A validated STG-I associate, by contrast, normally stays in general population unless confirmed STG behavior is documented, at which point the Institutional Classification Committee can place them in the Step Down Program.1California Department of Corrections and Rehabilitation. STG Tier Classification System – Adopted Regulations
What Tier II Covers
Tier II covers street gangs, disruptive groups, and organizations that may operate in a role subordinate to the dominant Tier I gangs. Examples include the Crips, Bloods, Nortenos, and Surenos. These groups can be dangerous and disruptive within a facility, but they lack the centralized prison-wide command structure that defines Tier I organizations. Tier II groups are not required to go through the same formal certification process CDCR applies to Tier I gangs.1California Department of Corrections and Rehabilitation. STG Tier Classification System – Adopted Regulations
The practical result is a higher behavioral threshold before restrictive housing comes into play. Validated STG-II members and associates remain in general population unless they have two or more documented incidents of serious STG behavior. Only then will the Classification Committee consider placing them in the Step Down Program.
How Someone Gets Validated
Validation is not a casual process. STG investigators, the Office of Correctional Safety, and the STG Unit Classification Committee share responsibility for initiating, investigating, and either affirming or rejecting a validation.2Legal Information Institute. California Code of Regulations Title 15 3378.2 – Security Threat Group Validation The Office of Correctional Safety houses the Special Services Unit, CDCR’s primary gang management and intelligence unit.3California Department of Corrections and Rehabilitation. Office of Correctional Safety
Evidence runs on a weighted point system. To validate someone as either a member or an associate, investigators must compile at least three independent pieces of evidence totaling 10 or more points.2Legal Information Institute. California Code of Regulations Title 15 3378.2 – Security Threat Group Validation Each type of evidence carries a set value:
- Legal documents such as court transcripts and probation reports: 7 points
- Tattoos or body markings depicting certified STG symbols: 6 points
- Offenses committed to benefit or promote the group: 6 points
- Self-admission: 5 points
- Photographs, staff observations, communications, outside agency reports, or documented visits with STG-connected individuals: 4 points each
- Association patterns, informant information, or debrief reports from another person’s debriefing: 3 points each
- Symbols such as hand signs, distinctive clothing, or graffiti: 2 points
- Written materials: 2 points if the person is identified in someone else’s materials, 4 points if found in their own possession
For Tier I validation, at least one piece of evidence must be a direct link to a current or former validated member or associate of that STG.2Legal Information Institute. California Code of Regulations Title 15 3378.2 – Security Threat Group Validation The extra requirement exists because Tier I groups are more insular, and CDCR wants verified connections rather than circumstantial indicators alone.
Notice and Disclosure Rights
Before the validation interview, the person being investigated must receive at least 72 hours advance notice, though they can waive this preparation period in writing. All non-confidential evidence used in the validation package must be disclosed and provided as copies. Confidential information, such as informant details, is disclosed through a separate confidential information form rather than being shared directly.2Legal Information Institute. California Code of Regulations Title 15 3378.2 – Security Threat Group Validation
Upgrading an Associate to Member
An associate classification can later be upgraded to member status, which carries heavier consequences, especially within Tier I. The upgrade requires three new independent evidence items, none previously used in the original validation, again totaling at least 10 points. At least three of those items must reflect behavior specifically indicative of membership rather than mere association.2Legal Information Institute. California Code of Regulations Title 15 3378.2 – Security Threat Group Validation
What Validation Does to Housing and Privileges
Where someone ends up depends on tier and member-versus-associate status. STG-I members face the most immediate consequences and can be placed directly in a SHU. STG-I associates and all STG-II affiliates generally stay in general population unless their behavior triggers a committee review.
For those placed in restrictive housing, conditions are severe. Restrictive housing means removal from general population, placement in a locked cell, and inability to leave that cell for the majority of the day.4Federal Bureau of Prisons. Program Statement 5270.12 – Special Housing Units In practice, that is roughly 22 to 23 hours a day in-cell. Movement happens under escort, often with restraints, and contact with other incarcerated people is minimal.
Telephone access drops sharply. Under federal BOP policy, a person in a Special Housing Unit receives one social phone call per month, offered within the first 30 calendar days of placement and every 30 days afterward; legal calls are handled separately and are not subject to this limit.4Federal Bureau of Prisons. Program Statement 5270.12 – Special Housing Units Visitation is commonly restricted to non-contact sessions. Personal property is limited to a small number of approved items, and commissary spending may be capped.
Getting Out: The Step Down Program
The Step Down Program is a five-step process designed to transition validated STG affiliates out of restrictive housing and back into general population. Each step sets behavioral expectations and progressively loosens restrictions as the person demonstrates compliance.1California Department of Corrections and Rehabilitation. STG Tier Classification System – Adopted Regulations
Steps 1 and 2
The first two steps take place in the SHU and are primarily observation periods. Each is designed to last 12 months, though the Institutional Classification Committee can accelerate progression at the 180-day review if the person has completed all required programming and has no guilty findings for STG-related rule violations. The Classification Committee reviews each case at least every 180 days.
Steps 3 and 4
Steps 3 and 4 begin reintegration with expanded programming, increased privileges, and a controlled social environment. Each step requires a minimum of 12 months. Out-of-cell time grows and access to group educational or therapeutic activities opens up. The person must remain free of STG disciplinary behavior throughout to advance.
Step 5
After completing the four SHU-based steps, the Classification Committee endorses the person for transfer to general population or a similar specialized housing setting for a 12-month observation period. Step 5 is a supervised trial run. Finishing it without incident closes out the program.
Under the current framework, the full program takes approximately two years at minimum if every step is accelerated, or up to five years if every step runs its full duration. Committing an STG-related rule violation at any step can restart the clock or result in retention at the current level.
Debriefing as an Alternative
Debriefing offers a separate route for people who want to formally drop out of an STG. It is entirely voluntary. Staff can ask if someone wants to debrief, but no one can be compelled, and the process can be stopped at any time. Waiving the right against self-incrimination is not a precondition. The stated purpose is to gather intelligence about the STG’s structure and activities, not to collect incriminating evidence against the person debriefing.5Legal Information Institute. California Code of Regulations Title 15 3378.5 – Debriefing Process
In Phase I, the person writes an autobiography of their STG involvement and has 30 days to submit it after receiving instructions. Staff verify the account for accuracy and completeness. The Debrief Intake Panel categorizes the case as either complex (Category 1) or less complex (Category 2). Category 1 debriefs, usually involving high-ranking positions or serious criminal activity, are handled by the Office of Correctional Safety’s Gang Intelligence Operations and typically take up to 90 business days. Category 2 debriefs are assigned to institutional STG investigators and normally wrap up within 60 business days.5Legal Information Institute. California Code of Regulations Title 15 3378.5 – Debriefing Process
Once the autobiography is accepted, the person enters an observation period of up to six months in a Debrief Processing Unit or Transitional Housing Unit. Staff monitor whether behavior is consistent with genuine disengagement.
Debriefing carries real risks. Providing detailed information about a gang’s leadership and operations makes someone a target for retaliation, and that safety concern is one reason many validated affiliates choose the Step Down Program’s behavioral pathway instead. If someone fails or refuses to complete the debrief process, they are placed in a Restricted Housing Unit for a review of safety concerns and reassessment of housing and privilege status.5Legal Information Institute. California Code of Regulations Title 15 3378.5 – Debriefing Process
When the STG Label Comes Off
Completing the Step Down Program does not erase the validation. Validated associates must remain free of STG-related disciplinary behavior for six consecutive years before they become eligible to have their validation status terminated. Validated members face 11 consecutive years.6Legal Information Institute. California Code of Regulations Title 15 3378.10 – Termination of Security Threat Group Validation Status
When the clock starts depends on the situation. For someone released from the Step Down Program to general population, it begins on the date the committee approved the release. For someone who was never removed from general population, it runs from the original validation date. For someone granted dropout status through debriefing, it starts on the date status was officially changed.
Termination is not automatic even after the required period. It gets evaluated at the next regularly scheduled annual review. The assigned counselor reviews the central file, notifies the STG investigator, and schedules the case for the Classification Committee, which makes the final call.6Legal Information Institute. California Code of Regulations Title 15 3378.10 – Termination of Security Threat Group Validation Status A new guilty finding for STG-related behavior, or accumulating 10 or more source criteria points during the required period, resets the clock entirely.
Challenging a Validation
Federal courts review prison classification decisions under a deferential “some evidence” standard. Courts do not independently weigh evidence or assess witness credibility; the question is whether any evidence in the record could support what prison officials concluded. California courts apply the same standard to STG validation. In practice, if the validation package contains three qualifying evidence items totaling 10 or more points with some factual basis, courts will generally uphold the classification. Successful legal challenges are uncommon.
Procedural protections still create openings. The 72-hour advance notice, the evidence disclosure requirements, and the confidential-information forms produce a paper trail that can be challenged when procedures are not followed. When confidential informants provide evidence and their identity is withheld for safety reasons, the record must include an affirmative statement from a prison official explaining why disclosure would be dangerous, along with enough additional facts to show the information is reliable.
Appeals generally run through the prison’s administrative grievance process. The critical point is timing. Deadlines are strict, and missing the window can forfeit the right to challenge the decision in court later.
How the Label Follows Release
An STG validation does not vanish at the prison gate. People released to federal supervised release or state parole with documented gang ties typically face specific non-association conditions, including prohibitions on communication or interaction with known members of the person’s former gang without prior permission from the probation officer.7United States Courts. Chapter 3 – Association and Contact Restrictions
Probation officers monitor these conditions aggressively. Their tools include interviews with family members and employers, home visits that note the presence of unknown individuals or vehicles, random checks of phone records, community fieldwork, and location monitoring technology.7United States Courts. Chapter 3 – Association and Contact Restrictions Travel restrictions may also apply. Violating a non-association condition can result in revocation of supervised release and a return to custody, even without a new criminal charge.
For anyone trying to leave gang life behind, that means knowing exactly what the conditions prohibit and clarifying gray areas with the supervising officer before incidental contact becomes a violation.