If your threat model is the police, a wrench could be a best case scenario for you. If you can prove the police took a wrench to you during an interrogation you're definitely getting the case thrown out.
LOL. Yes, possibly, but think of the time. I didn't break when the cops put a loaded gun to my head or threatened me and refused me a lawyer. I broke an hour later when they decided threatening my wife would be a better plan.
It took 7 years of sitting in jail to get the judge to watch the video and throw shit out.
With police you can start a Twitter mob if you're lucky but there are ten thousand other George Floyds out there that didn't get any justice when police took wrenches, tasers, knees, guns to them.
And that doesn't really apply to the CBP and the CBP equivalents of other countries. They're ruthless and can lock you up in cages, there isn't really the opportunity to start a "case" until you're past the CBP. If you aren't a citizen you sadly don't have access to a lawyer if the CBP wants to hit you with a $5 wrench, because you aren't even in the US yet.