There are almost 100k public schools in the USA.

Let's assume a police officer in each school costs $50k/year.  (And that probably doesn't include pension costs).  That's $5 billion dollars per year.

There are around 10m guns sold in the USA per year.  So to fund this we'd have to add a $500/gun tax.

I couldn't find stats on ammunition sales, but it might make even more sense to tax bullets.  Maybe based on their lethality.  BB guns are free.  Cop Killer bullets are $2000.

[left this originally as a comment Dan Gillmor's post, but I think it deserves broader sharing since I think it puts this whole thing into perspective...]

#gplus