Green’s Dictionary of Slang

(drugs) a urine analysis, carried out to check for drug use.

1979		D. Cluster They Should Have Served that Coffee 162: The piss test was their [i.e. former addicts] judge.
1992		R. Price Clockers 309: ‘You got a piss test, Strike?’ Thumper said.
2006		Re’al ‘Bull’ Oney Hellions! 32: My piss test came back and it was okay.
2012		L. Jose ‘Underhooks’ in Crime Factory: Hard Labour [ebook] Bentley gestured with the bong. Sammy shook his head. ‘Piss tests’.
2013		J. Stahl Happy Mutant Baby Pills 43: I was supposed to report to a probation officer and take random pee tests.
2019		D. Winslow Border [ebook] The rules of the place said that Martina had the right to give her a piss test and it rang the bell so she was out on her ass.