That really pisses me off. fuck the police.
On another note -
A marijuana seed could burst in your pipe, sending shrapnel into the eye and causing severe burns and vision loss. That dope is dangerous!
Seriously though, your friend probably suffered an episode with low blood pressure. Or there was another cause. In other words, something happened when your friend consumed cannabis, and it could have been set off by other things as well. I believe that cannabis consumption is a legitimately safe thing to do, although sometimes there are other factors that make it somewhat hazardous - such as extremely low bp, or police tazers