This course breaks down the constitutional limits on handling and running firearm serial numbers, explaining when physically moving a gun becomes a separate search under Arizona v. Hicks and why plain view matters. It clarifies that running a serial number is generally lawful if the number was obtained legally, but warns that timing issues under Rodriguez and improper handling can turn a good case into suppressed evidence. Officers learn the correct sequence, articulation standards, and practical safeguards to avoid Fourth Amendment violations.