Do they drug test you when you go to jail for the weekend?

I was charged with petty larceny and have to go back to court for the second time in a few days. The first time the witness from the store didn't even show up and was no where to be found so they extended the court date to give the store more time to try and find the witness. My lawyer said I might have to spend two nights in jail but there was a good possibility I no longer have to since the witness was a no show. My real question is that do they drug test you if you have to go to jail for the weekend. This is in roanoke, virginia if that makes a difference. Thanks!