Some points to observe :
1.The moment a provider removes her top is an automatic proof that she is not a cop. No female cop ever ever [ repeat never ever ] removes her shirt and gets topless showing her boobs. A male cop on the other hand can and will do pretty much anything he wants. He can have sex for the whole session and then bust the provider. So 2 different scenarios here.
2. The provider here had thought that the OP was a cop as she got a call that there were 2 cop cars outside. So, relatively , she should have been more nervous than the client. But the thing to consider here is - if a male cop wanted to bust you, he would have done so. No cop is going to leave a target once a sting has been initiated. So, it's naive to think that the provider here avoided the arrest.
3. Minimum to no screening - I think that's what led to this incident in the 1st place. You take a risk when you see BP clients or providers - because there is no screening or no references. So if a BP client busts a provider - I would say that it's the provider's fault because she decided to use the BP option which has no screening at all.
4. So , all clients or providers who want to use BP - inherently take a big risk and there's a high chance that you can get busted. So, if you are not prepared to take that risk, then dont use BP.