Hm, That's nice and all, but there was no control group or other variables, from what I could read (can't watch link right now)

Did she try it with a few other cops with a less serious demeanor?

Did she have friends of other races/sexes try this? Were they serious/playful?

What neighborhoods did she go to?

How many cops did she try this on?

What time of day was it?

I mean, if she did all that and still got preferential treatment, then I'll get up in arms. I know cops are getting a bad rep lately and I am not saying it's not deserved in some cases, but I'd like to think cops aren't mindless attack dogs and that they can access a situation that isn't immediately dangerous.