Not to look a gift outbreak of common sense in the mouth, but how the fuck can GPS trackers be a form of search and seizure and civil forfeiture NOT be a form of search and seizure?
It's a form of seizure, but the supreme court hasn't found it an unreasonable one. And it's been used for a very long time. Basically, the issue was that without forfeiture they had a hard time catching the owners of smuggling ships. As long as you can't establish them as an accessory to the crime or you have jurisdiction problems, they can legally provide the supplies while the criminals operate on an asset-less basis. So the solution was to declare the assets - in this case the ship - used in illegal acts forfeit, making it a risk and a cost to be used in crime. This goes all the way back to the British.
I've been reading some of the court cases and it seems the minority has been trying really hard to find tortured ways of getting out of their own past precedents as the cases become more and more unreasonable but the majority falls down on "we've approved of civil forfeiture for 200 years, we can't overturn that now". They really, really, really don't like interpreting an old law in a new way. So without acts of Congress saying this is not okay, I don't think anything will change.
P.S. Civil asset forfeiture puts the US way ahead of the UK as fascist country in my opinion, I'm not really even sure if it should qualify as an "innocent until proven guilty" system anymore since you can be robbed blind and need to prove your innocence to the court. It stinks to high heaven.