SurfNturf-Sometimes evidence is not properly collected and often degrades as a result. These problems in collecting evidence, especially DNA evidence can pose a problem because if the evidence is not collected in a timely fashion, the integrity of the evidence becomes tainted and the evidence can not be used.
This is another source of frustration for prosecutors. Many defendants that would have otherwise been convicted are found not gulity and often go on and commit more crimes.
The recidivism rate among criminals is very high. Gathering evidence properly can either make or break a case. Sealing off the crime scene immediately is the best way to gather fresh evidence.