I've seen videos where people were pulled over
for these suspicious acts....
- Driving just below the speed limit.
- Driving exactly the speed limti.
- Driving slightly over the speed limit.
As we can observe, the traffic laws are so numerous
& flexible that a cop can pull over anyone just by
following a driver a few minutes, & waiting for an
articulable violation to occur. And then, there is no
threshold below which the cop can't arrest the driver.
Further justification can be invented based upon
highly subjective (non-disprovable) things, eg,
smelling weed, smelling alcohol, air freshener
hanging from the mirror, acting nervous, acting
subdued, glassy eyes, bloodshot eyes, slurred
speech, furtive movements, fitting the description
of a person of interest, laughing, being emotional.