They actually researched this? I used the relocation method with chipmunks.
Catch chipmunk, take for 5 minute car ride and drop off in front of someone else's house.
I still say getting them drunk is much more fun.
Seriously would you rather die by being, poisoned, crushed, catapulted, cut up by egg shells, or while drinking beer?
I vote for beer.
I've tried beer traps, one year. I have a small garden. And the beer brought all the snails to my yard, so I ended up with more than I had to begin with, and the neighbours had less. Now I just let them be, most of the time, pick them from the plants I really don't want them on, but the others can stay where they are.
I posted it because they did actually research it. The visual of men seriously tossing marked snails over a wall for six month was tickling my funny bones. And then numbering and sorting uneven from even snails made me grin even more.
I admit, I would not have mind at all, being part of the research team.