And they changed it, correct? The justices agreed that telling the officer you have drugs in the car when questioned about the officer smelling marijuana, constitutes probably cause enough to search the vehicle.
Before you could walk up to a cop, if you wanted to do so, and say you had weed in your car. That in itself is not probable cause for a search of your vehicle. At least previously. Even if it is probable cause, the officer has to take that cause to a judge for a warrant to look for specifically that item.
Now all it takes is some shady cop looking to bust your balls to state, "Hrmm I smell weed in your vehicle get the fuck out while I look for it."
Say you don't have that in your car but you have a legal to own gun in there. Cop confiscates the gun saying it could be illegal. Do you know the bullshit you have to go through to get it back assuming you ever do get it back? Not to mention possibly arrested, lost work, lost job, and a whole host of problems that come from something like that. All because some bullshit police officer looking to bust our balls does because the law now allows him to be the biggest dickhead and get away with it.
Or worse yet, they find your phone with your kid's pictures in it. I have a newborn son which includes now a couple of pictures of him being born. Guess what, the kid came out out naked and stayed that way while they weighed him. A dickhead cop can no bust me for child porn which in some places even an allegations can get you flagged on the sex offender registry even if you actually don't get busted for it.
This was something the 4th amendment was suppose to stop.