I put all this information into F.O.S., the Friendly Online Supercomputer and after 3 days, 6 hours, and 27 minutes the response:

Number of plausible explainations - 1.
1) Your friends EACH have 1.5 dead bodies in their trunks..They therefore are each not only involved with the murder BUT they conspired to cut one of the bodies in two! F.O.S. has already alerted the local law authorities. Exersise EXTREME caution around these individulas until the police arrive. Have a nice day..

1999 Amazon Green SVT Contour (#554/2760) "People demand freedom of speech as a compensation for the freedom of thought which they seldom use." -Soren Kierkegaard (as posted by Jato)