I don't think they had PCP in '57. Drunks were probably the most common 'druggies' back then, and having a drunken Barney sitting right next to you as you cart him off to the pokey would be sort fo fun, and surely liven up your shift a little bit. And if he got out of line, he's RIGHT THERE, well within stun gun range.
Wait. They didn't have stun guns back then, did they...