One Year....No Evidence

I read in AOL that on April 25th, 2009, a 17 year old dissapeared in Myrtle Beach, S.C. She left her hometown of Rochester, N.Y. for spring break and never came home. She left the Bar Harbor Motel to meet friends at the Blue Water Resort nearby. She arrived at the resort and left roughly 10 minutes later according to surveillance. That was the last anyone saw Brittanee Drexel.
Closing in on one year after her dissapearance, people have started calling in people of interest. South Carolina police say that around 20 people have called in and all the evidence given leads to 4 suspects. Although the evidence is very strong, there still isnt enough to get an arrest warrant. The information given to police leads to the conclusion that 17 year old Drexel may no longer be alive.
I personally think that if they have enough evidence to say she is deceased, they should be able to do something about this. 20 different people have evidence leading to the same people and you can't get a warrant??? It's 20 people!!!! Doesn't that say something? This is exactly why people can get away with this...we "don't have enough evidence" so we let them get away with it. I don't know about you but i think this is rediculous...tell me what you think.