Color of the Day — undercover police identification

How it works

Typically, the assigned color is communicated at roll call or by supervisors before a tour of duty. Undercover or plainclothes officers may wear the color as a wristband, headband, shoelace, hat trim, armband, or other small piece of apparel that can be seen at close range. The objective is brief, discreet visual recognition: uniformed officers who see the matching color can withhold lethal force or take other confirming actions. Departments may rotate colors daily or by shift to limit the chance that non‑officers learn the signal.

History and development

The practice emerged in large U.S. cities during periods of high street violence as a practical response to friendly‑fire and mistaken‑identity incidents. It became widely associated with the New York City Police Department and predecessor agencies in transit and housing policing during the 1970s and 1980s, when plainclothes assignments were common in high‑risk environments. Since then, variations of the system have appeared in other jurisdictions and in different operational forms.

Operational considerations and limitations

While useful, the color system is not foolproof. It relies on the secrecy of the day's color, clear sight lines, and timely communication between officers. If the signal becomes widely known or is observed by suspects, it can be copied and abused. For these reasons, departments treat it as one layer of officer safety alongside radio identification, verbal challenge-and-password procedures, body-worn cameras, and uniform checks. Policies about who authorizes and distributes the day's color vary by agency and are generally internal.

Uses, examples and cultural references

Beyond its practical role, the "color of the day" has appeared in police procedural media and journalism, which has helped public awareness but also increased the risk that the signal could be learned by the public. Television shows and novels have sometimes depicted the practice, usually in procedurals set in New York. In real operations, colors are deliberately simple to avoid confusion and are chosen for short-term use rather than permanent insignia.

Distinctions and notable facts

• The system differs from formal identification methods such as badge display, radio codes, or biometric verification: it is a low‑tech, short‑term visual cue.
• Because there is no universal standard, the practice and safeguards vary significantly between agencies.
• Departments weigh the benefits of reduced friendly‑fire risk against the danger of public disclosure and potential misuse.

Further reading and resources

• Agency policy overview
• Training bulletin
• Historical summary of tactics
• Urban policing practices
• Uniformed officer safety guidance
• NYPD procedural notes
• Transit policing history
• Housing bureau practices
• New York City law enforcement context
• Examples of approved accessories
• Equipment and uniform guidance
• Precinct roll call procedures
• 1970s–1980s policing environment
• Press coverage and analysis
• Depictions in television and film
• Contemporary reviews and critiques