Green’s Dictionary of Slang

toss n.2

[toss v. (7)]

(orig. US prison) a search, esp. one carried out by police, also attrib.

[US]Goldin et al. DAUL 225/1: Toss, n. [...] 3. (P) A search of prison cells, shops, recreation rooms, etc., as differentiated from a search of the person.
[US]N.Y. Times 19 Nov. 106: A toss is no funny business, and the risks for a cop are enormous at all times, and for this reason he has mastered some extremely impressive techniques.
[US]J. Ellroy Brown’s Requiem 72: When he closed the bathroom door, I hopped up from my chair and gave the room a quick toss.
[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 192/1: toss v. (of an officer) to conduct a thorough search of an inmate’s cell.
[US]J. Ellroy Widespread Panic 117: Connie snored [...] I had time for a top-end toss.
[US](con. 1962) J. Ellroy Enchanters 257: It’s an oversight. The toss cops shined the knife on.