It can't be easy sitting alongside a highway for hours on end, waiting for someone to do something that requires your intervention.
Police engage in shared fantasies. Which can lead them to hallucinate. They often end up wanting a crime to be committed just so they can intervene and exercise and validate their skill set.
Civilian behaviors will be observed, recorded, and matched: against a theory of a crime which may or may not have been committed. Depending how bored and unfulfilled the coordinated LEOs are, a dark fantasy of ongoing crime can be enabled, and confirmation bias follows immediately, with every civilian action (or inaction) being re-interpreted through the lens of an understandable rampant LEO desire -- They want so much to catch the bad guys that they will actually manufacture probable cause from stretched whole cloth, so they can believe a crime is in their purview and they're righteously on the case.
Otherwise it can become a really boring gig.
Advances in surveillance technologies and predeterminations of crime probabilities via automated software will only serve to add fuel to the fire of the aggregate LEO imagination.
What we witness here in Texas is the result of a shared fantasy. Remember that shared fantasies become more real the longer they are shared and sustained... even the "trace" amounts of imaginary drugs on which Max the dog alerted become a part of the now-permanent interdiction team's backstory.
This kind of thing is happening all over America, all the time. We face a crisis of fantasy addiction. So many are unhappy with reality that they are constantly fantasizing something better for themselves.
Not to pick on the LEOs, but they are supposed to be the best of us, holding the line, and not compromising their integrity for the transient satisfaction of an imagined felony stop.