I try to put myself in that position that night. If I was at one of the Field Parties, you can bet my parents didn't know I was there. So would I go to the police if I had information?
SavageMark, that is a good point. Thinking back to my youth and being that age I might not have come forward with pertinent information that wasn't physical, hard evidence (gun, keys, etc.) either. The fear of punishment would be a great deterrent for 15-18 year-olds. After nearly 20 years it would be great if some people would come forward and discuss what they saw/heard even if they don't think it is critical.