Law enforcement has always had a rather malleable and subjective set of "tools" to generate probable cause.
"Your eyes look glassy"...
"I smell alcohol"...
"I smell pot"...
If my eyes weren't *expletive deleted*ing "glassy", I'd be blind and unable to blink.
Whole thing is a tangled mess. On one hand the police are dealing with low-lifes 90% of the time, so bullshit made up PC usually bears fruit. Despite my strong Libertarian leanings, I admit to having very little concern about any one individual low-life. And it's possible the "broken windows" theory of policing is true, and easing up on the petty stuff and traffic stops would cause a significant bump in violent crime.
Problem is twofold: It's really hard, even nigh impossible to get truly objective data on these things because of the near impossibility of setting up a proper control group. NYC ends "stop and frisk" and shootings go up... was it really because stop and frisk ended, or was it just other demographic and economic pressures that would have made it go up anyway.
OTOH, it's really hard to watch "Live PD" for more than 15 minutes and not think that the whole damn thing isn't just a long running war of mutual attrition between the poor, and those with low social-capital and the police. I'd estimate that for less than one quarter of the police interactions they air, I can identify an actual "victim" (not counting the State, and it's taxes/fees) something like breaking up a fight, protecting private property by evicting squatters or dealing with a stolen vehicle.
When more than 75% of the show is minor moving violations followed with "why do I smell marijuana"... the whole #BLM thing starts making sense, where the REAL angst is coming from, and that the actual shootings are just an obvious focal point that gets attention.
But then, if they weren't out "rolling and hatin' looking for those riding dirty" how bad would it be with the real crimes and the real victims?
Then I remember that ideology provides clarity. Worrying about the overall crime rate is a collective response. And no collective result is cause for the weakening of individual rights.