Questions with the keyword 'spy'

• Can you actually see the hidden lasers if you spray water on them (like they do in spy movies?). Thanks. by shoetree3 to Mike, Pip, Tianfu, Tim, Tom Comments: (No comments so far )
• Are the security lasers in spy movies actually used in real life? How do they work? Thanks! by pegasister and 1 other. to Mike, Pip, Tianfu, Tim, Tom Comments: (No comments so far )