This kind of has big implications.
http://www.supremecourt.gov/opinions/14pdf/13-604_ec8f.pdf
Basically, some guy had a brake light out and got pulled over for it in NC and the during the stop the cop found some drugs on the guy, but it turns out that in NC it's not illegal to have one brake light out but the cop didn't know the law here, he thought it was illegal. So the guys lawyer argued that since the cops reason for the stop wasn't legal then the stop and search of the car were suspicionless and should be thrown out because it violates the fourth amendment. The case goes to the supreme court and the supreme court sides with the police.
What does this mean? It could mean that police can now violate your fourth amendment rights as long as they are ignorant of the law. Now, I get that it seemed reasonable for the officer to believe it was illegal to have a brake light out, I believed the exact same thing until I read this, and it kind of is a reasonable error, but ignorance of the law shouldn't override constitutionally protected rights. So now as long as a cop honestly believes he is right to detain and search you, he can violate your rights legally?
The fourth amendment is already abused constantly by police, half the articles and videos on this thread are of police violating the fourth amendment, and now thanks to this ruling it's all legal now.