Possible Clues:

• Sensor's job
• Garda? have a job doing this? The thieves have a job avoiding it!
• Discovery
• Police work not involved with deceit
• Gumshoe's specialty
• ... note cited: prepare for discovery
• Uncovering deceit? Not difficult!
• What sleuthing is all about
• Police work cited note in question
• Dubiously enticed to find something out