Evidence is a key component in any drug case. The following are examples of cases where evidence, or the lack thereof, can determine the outcome of the case:nPossession with the intent to supply (PWITS) a controlled drug: While the amount of drugs in your possession may suggest an intent to supply them to someone else, the amount alone is generally not sufficient evidence. Police must look for items that are used to supply drugs, including scales, “deal bags,” a list of customers, and text messages indicating transactions.