How to Tell a Landscaper From a Thief

If I can see a person standing in front of a neighboring house inspecting the windows and the doors, should I call the police?

Maybe it is the air-condition technician looking for the best place to install a new air-condition unit, or maybe it is a robber doing reconnaissance and checking what is the easiest way to get into the house. It is hard to tell!

Now what if I can see a user sending requests to non-existing pages in my application?

Maybe these are broken links created mistakenly by that user, or maybe these are attack reconnaissance, pre-attack activity done by a malicious user. It is also hard to tell!

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