Not that I'd really want to use this.. but as far as I could see in the regs (here in QC anyway) it didn't seem to violate anything in any glaringly obvious way. It's basically just a springloaded hook... nothing finesse about it though.
Some Finnish dooods from work had used this back home...
I think you pry it open, put your bait, then it snaps closed when triggered like in the bottom picture.
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