There is a lot of worry about LEOs and steroids, because for a lot of LEOs, brawling is part of the job, and though most of those they brawl with are drunk and stupid, it takes its toll.
I have met some cops who can just read off a litany of their injuries: a dislocated thumb, a knife wound, half a dozen scars, a tooth or two knocked out, broken nose, etc. It gets real tired in a hurry.
Not so much peer pressure than job pressure. But, I imagine, if one officer in a department starts using, and it works for him, the fact is not lost on his peers.