Pointers to consider:
(1) smells like there is cop presence means it's a cop; police have a distinct dirty rat scoundrel smell; that gut feeling that the place is anti-hobby
(2) girl doesn't emit sexual energy or is a turn-off, then it's probably a cop. Real hookers have been having sex before you came in so you can smell it on them.
(3) good English speaking Mammason that dresses normal and not in non-sexy granny bedtime clothes means she's a cop
(4) girls that are dressed in normal or boring streetclothes or not sexy like a bathrobe means that they are decoys or cops
(5) white and Hispanic staff with no Asians or do Asians that speak perfect English means that they are cops
(6) spa doesn't smell like funky Asian food means that they are cops
(7) Pretty girls especially if they are American or white that look healthy means that they are cops. Spa girls aren't that healthy and look like it too
(8) Mammason or girl asks a lot of questions (have you been here before, how did you find this place, did you call, what other places have you been to, etc.) that don't pertain to anything but trying to gather more information or evidence that will incriminate you means that they are a cop. Real spa hookers don't like talking: they want you quickly in and out.
(9) Big open space spa means it's an easy place for Vice to hide inside. They are cops.
(10) Girl who immediately addresses menu list and rates are cops
And for the cops who are already lurking in Eccie, FUCK YOU!!!