Answer:
Looking through a suspect's garbage for possible evidence.
Step-by-step explanation:
When an investigation is being carried out, looking through a suspect's trash is a good strategy.
People tend to discard relevant documents in am investigation through their trash, and looking through their garbage can uncover items that will give insights on cases.
For example if an individual commits a fraud in the process of concealment he may have torn up a document, and put it in the trash for disposal. People feel nobody goes through trash and that it is a good way of disposing evidence.