First rule of being a crook: be careful when you're being watched.

Wahid Nazary was an employee at an ARCO gas station franchise in Oceanside CA. In the space of of 23 months, he stole $227,000 from the cash canisters inside the gas pumps, apparently to pay for his addiction.

When the franchisee's auditor notified the owners of a growing series of discrepancies, the franchisee worked with local police to set up a sting operation. But within a day of installing hidden cameras in the ceiling of the manager's office, Nazary spackled them over. When the franchisee changed some locks, Nazary called a locksmith and changed them again so that only he would have the key.

Ultimately the franchisee installed cameras in the vents, which Nazary did not find.They saw Nazary on video smoking heroin (which the "Heroin Helper" site notes is indeed the most efficient way) and they confronted Nazary with Excel spreadsheets showing the $227,000 loss. Nazary sweated, fumbled with his cellphone, slapped himself in the head, and ran out to his car and drove away.

Nazary got 2 years in prison.