Do you think the police force needs to be retrained?

It seems everywhere you read these days the police are botching up crime scenes and tainting the evidence or forgetting to read the criminal his rights.An yet on these critical errors the child molestors,rapist,and murderers get off.An then sometimes the police does their job and judge lets the person go.An 100's of thousand dna kits sit at the crime lab untouched. My friend was brutally d and killed in 1997. Do you know they still dont have any leads!The person took her clothes . Left her nude in a ditch .they have dna from her and him. But it seems like once a year they could run the dna through the system just to check if that person had committed a crime again.Wheres the cold case squad when you need them?The president can send 140,000 troops to Iraq and scare us all to death about terrorism . But is he blind to what is going on in his own nation?Sorry just a little venting there.