Fair enough - I read your original post as drug cos were paying for the drugs and prostitutes too. I stand corrected if you weren't saying that.
And I'm absolutely not saying that doctors don't go for it out of hours; drinking to excess is endemic, and yes, there's no shortage of drugs circulating either.
All I can say is that I have discussed this issue with a lot of people who I know well enough to trust their response, and to a man every one of them has maintained that there is no system of backhanders in place. I am not a fan of the drug companies for many reasons, but I do think that regarding this the accusations are baseless.