Here's what I found on some other sites about the injections, MrDevious. Normally the first chemical apparently puts the condemed people to sleep so they don't feel the others. But that doesn't sound like what happened in the 34-minute Florida case. From what I've read, they didn't get his IV inserted properly. It apparently went into tissue instead of into a vein.

I know this is a similar method to the one veterinarians use to euthanize animals. First sedation, then the other two chemicals stop respiration and heart activity.

http://en.wikipedia.org/wiki/Lethal_injection
http://people.howstuffworks.com/lethal-injection.htm
http://www.deathpenaltyinfo.org/arti...scid=8&did=479