The last paragraph here is instructional for anyone considering a similar gift to charity:
Somebody left about $8,000 worth of marijuana in a clothing donation bin outside a bookstore in Boulder.
Officers were called after volunteers Thursday found a large bag of a green leafy substance later determined to be two pounds of marijuana.
Boulder police spokeswoman Sarah Huntley said the marijuana will eventually be destroyed.
(Yes, it's entirely likely someone was just trying to ditch some contraband for some reason, or that someone simply forgot they had pot stashed in some old pair of jeans - but it's just as likely some wacky stoner thought this was an actual good idea. Those wacky stoners!)