That cop had no right to stop that vehicle in the first place. So, anything he did from then on was illegal.

It is so easy to blame the courts when the real blame should go to the police. I cant tell you the number of shady tricks the cops and wardens have pulled while I was working in law enforcement.
My own supervisor insisted that I lie on the stand and I refused.

Make the case; make it right and the bad guys don't go free. In 17 years of law enforcement I lost one case. My witness was scared out of his mind and he blew it.
The reason I lost only one case was because I did not bring half assed cases to court. If I couldn't make it iron bound I did not bother.