Related Clues:

• Buster?
• Bug someone, e.g.
• Nonuniformed police officer
• Catch a glimpse of
• 'Traffic' cop
• Drug agent
• Stratego piece
• Maxwell Smart, for one
• Watch covertly
• One who works with dogs, maybe
• Snoop (on)
• Microfilmer, maybe
• Pusher's bane
• Sneak a peek
• Drug pusher's enemy