Yeah, like a backyard with a privacy fence!
An interesting thought, about the illegal search thing, but I think the reasons used in US Law for dispensing with any evidence 'from a poisoned tree' so to speak has more to do with uncertainty about the validity of said evidence. Not to say the evidence will be tainted or invalid, but that if the officer could not be arsed to follow the book to obtain the evidence in the first place, the chain of evidence is tainted from the onset. Better to let 100 guilty men go free type of thing.
Sure, planes may be right out, perhaps shipping too, but trucking? No way. I don't know how much more efficient it would be, but what about a system like they use in diesel locomotives, and in ships (engine turns generator, electricity from generator turns wheels). IIRC someone in Oklahoma started refitting cars with a similar system, Neil Young was one of his first customers (classic Lincoln, I think), claimed it got 100 miles to the gallon. Can't be arsed with a link right now, but this is slashdot, I'm sure someone can find it.
Top Ten Things Overheard At The ANSI C Draft Committee Meetings: (5) All right, who's the wiseguy who stuck this trigraph stuff in here?