I bet there's quite a bit of funny business going on in the more competitive areas of the country. Texas, New York, CA, etc would all be good bets. Hell, people take 'roids for cosmetic purposes, you think they aren't going to do it for competitive ones? I don't care if it's CAT 1,2,3 or just for bragging rights at the weekend Hammerfest. Some guys just can't help themselves.
For $400 and 2 minutes with Google you can get the proper steroid/hormonal stack for cyclist, triathletes and marathoners delivered to your door. You can bet your ass that it'll make a big difference in your performance. Have I done it? No. Did I check it out just to see how tough it was to find? Yes. Easy-peasy-japanesy....
You're kidding yourself if you think all your competitors are clean, but you'll drive yourself nuts if you worry about it.