“Let’s say I train my dog to always “alert”, now what? Prove you’re innocent, that’s what. “
You are never convicted based on a drug dog. The only effect of the drug dog is to give reasonable cause to conduct a search, with the possibility still existing that any evidence found will be thrown out of court.
I don’t like it. “Fruit of the poisoned tree” must be the rare exception, not the rule, for somebody hauled into court. It really looks like you are espousing “guilty until proven innocent” as the law of the land.
“You are never convicted based on a drug dog.”
No, the dog has to find the drugs a bad cop planted in your car first.
That’s the point, you have no control of your guilt or innocence if there is a dishonest cop. They could also use it as a way to extract bribes, “favors” from pretty women, or even seize a nice car, or just to deliberately detain someone they feel “needs it”.
When they have to establish probable cause through legitimate means, there is no danger of any of these things happening.