I sold equipment to all levels of government for years. I found corruption at all levels in some form or other. After the Nixon affair, things were more black & white for awhile - they would not even let you buy them lunch or they would flat out tell you that if you paid them so much you would get the bid! That only lasted a few years then it was back to the same old way.
There were some places that were run on the straight and narrow. When I worked for ADOT, we could accept a cap from a vendor; we could go to lunch with them but not out to dinner.
Some guys tried to influence the specs that I wrote but I told them that was the door where they came in. The most obvious was the Cat saleman and a female salesperson who tried to interest me in her own type of corruption - didn't work on me!
I slept well and never had to worry about going to jail.