I can't believe everyone's overlooking the obvious solution: build four strategically placed snipers nests, stocked with snipers with tranquilizer darts. You don't even need to best snipers, since they should be able to get several shots off between the time that a guy starts climbing the fence and the time that he gets to the top. Maybe it could be part of a police academy training program.
You'll need about 16 snipers working 40 hour weeks to cover the whole year, and I'd allocate about $50,000 each per annual wages (unless you go the training route, where you can probably reduce this to next to nothing). That comes out to less than $1 million per year. Now, I don't know what the lifespan of these nets is, but unless it's 50 years or so, the sniper nests are going to be a better investment.
As an added bonus, EMS costs go down, since it's a lot easier for them to just drive by and scoop an unconscious guy off the pavement rather than trying to get them out of the nets. And the thrill-seeker element goes down, too.
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