When you walk close to any police car, the arrested ped who is following you or being grabbed, might be put into the vehicle using menu Notify the player when the ped is intoxicated (alcohol or narcotics) The ped may flee if we attempt to arrest them. The ped will comply as long as the vehicle is not moving
The stopped ped will have a yellow blip with 'human' icon. Using menu, you may: Ask ped's ID, Issue warning, Question the Ped, Follow Me, Take the ped from behind (grab), Pat Down the ped, Conduct Breathalyzer test, Conduct drug swab test, Arrest the ped, Release the arrested ped, Ask ped to kneel down or get up, Request nearby Police Buddy (from Ultimate Backup) to watch the ped, Request escort vehicle for the ped (Taxi, Uber, Ambulance, or Police Transport) You may stop the next nearest ped by doing the same command
To comfortably Stop the ped: Stop the nearest ped peacefully (only one ped at a time) or Stop the ped at gunpoint (while aiming your weapon at the ped)