Tisha has a great system, using on people she knows the behavior of as a baseline.
The cop thing is great, too. Cops just don’t do that. That’s really unusual. I think a lot of us will attribute the truly unusual events like that to pheromones we may be wearing, and I think that’s generally OK. Not as good as having a baseline, but really… a copy apologizing? That’s just weird and uncalled for. 
With me, I notice them working when I get responses to me that are unusual. P74 kinda makes it like I’m the cool, hang out dude in the band, and I haven’t experienced that in YEARS. (since I was a cool guy in a band!) That just knocks my socks off. It’s so different from pheromones and my normal experience without pheromones.
Switching between pheromones is a great way to tell, especially with the little portable “To go” ones. You can have something friendly on, get into a conversation with some people, then leave for a second to literally “turn up the heat” or whatever you want. You can see people’s behavior change almost instantly when you come back. It’s just aaaaamazing how different they’ll act! It’s very tangible proof of what these crazy little things do.