Know the laws in your state. In Ohio, it is illegal for the police to use your stuff (phone, laptop, etc.) that were seized during an arrest or warrant, without your signed permission. They have to get a warrant in order to force you to give up passwords, log-in names, etc.
Other states do not have this law. They can use whatever they seize against you, or against others, at any time.
Another thing to realize is that most states require a signature/permission from the 'arrestee' before using your phone, etc. Sometimes when arrested, providers and hobbyists won't be thinking straight, and sign over their rights to the personal info on their devices. This is how LEO can get inside the hobby community, and bust the more 'cautious' participants. This entire scenario has been happening in Indianapolis since the beginning of this year.
First of all, always immediately ASK FOR YOUR LAWYER if arrested. Don't believe their lies of 'leniency' for turning over your log-in credentials.
If, for some reason, they do confiscate and use your gadgets, GET THE WORD OUT ASAP to the community, using a hobby buddy or provider friend. No reason to get other people busted just because you slipped up.
Remember the sound of people's voices -- a simple phone call can determine if the person on the other end is who you remember seeing.
Don't let your guard down, and never let yourself feel 'safe and cozy' in the hobby. Well-respected providers and clients alike can get 'popped' at anytime, even more so if they start to slack off in their screening/research.
Ladies -- ask for a picture of new clients, when they book. Then, right before the appt, have the client take a pic of himself, using a unique hand-signal, sticking out tongue, etc., and make sure it matches the first pic you got.
In terms of ID, I don't think asking for ID would have helped the girl in this situation. The police obviously have an image of his DL from the arrest, and could have used that, and sent it to the lady.