Chicago
I've told clients that if she doesn't ask for verification (Roomservice, date-check..) then do not go there.
Of course then the argument is "How do I know she even checked?", good question and glad you asked. It's a pain in my arse to send 2 verifications at times and Cathy is not fond me of misspelling or getting a phone number wrong; but to double check that the provider is checking you out just put the wrong city or the wrong #. Cathy will tell any provider "He's not verifiable" and the provider will contact you back and state this. If she doesn't then either she's careless OR she's not really checking 
I've had a client recently that was so paranoid I was freaking out the entire session (not fun). Please for the love of g-d calm down! Providers have had this against us since day 1, we get your concern (glad a few of you finally have some now). Please don't spend 1.5 hours of your 2 hour session interrogating me and nervously twitching. If you can't trust me just don't book, please?
Now people have asked why I didn't advertise on RS2K (because as we know if a girl doesn't show up often or gets into trouble she's tossed), when I came out from utr I did what was marketable. Which is why I chose ero's and paid for verification. People don't check rs2k *unless they are from here* they check ero's guide. Advertising isn't cheap and I did what was right. However that being said, keep it in mind a lot of starting out providers don't have a lot of money or aren't too sure of their staying power so they may not want to invest 100-400 bucks in verification, website, phone and ads. Now if she's been around for awhile and there's no phone, no website and no ads be suspicious. The review aspect, well honestly they are a catch 22 for us ladies. Damned if we do and damned if we don't.
I would never ever do an incall at O'hare, or any burb period. I don't do hotel rooms. Here's the one thing to keep in mind about why some known providers go out to Ohare. They advertise on Ero's, people fly into chicago for conventions, the men stay near the airport. It's easier for the guys to travel etc and if they are out at Ohare and not in the city then why choose a provider that's downtown when one is 3 hotels down the street? As far as why police choose certain counties, well it has to do with funding and staff.
With anything use common sense but if you're too paranoid please just stop hobbying. I even see other men share this sentiment too. Yes it's risky, always has been this is Cook County! For shits sake this is America and unless you're in legalized brothels then you are going to have to assume some risk. The paranoia of some clients is out of control and to the point that it ruins a session for me, this is working against them in several ways.