Green’s Dictionary of Slang

frisk n.1

also frisking
[frisk v.2 ]

[late 18C+] (orig. UK Und.) a search.

In phrases

on the frisk

working as a pickpocket, i.e. ‘searching’ the pockets / bags of strangers.

skin frisk (n.)

[1930s+] (US prison) a strip search.

stand frisk (v.)

[19C] to be searched.