My mom checked into her hotel and noticed a tiny blue dot sticker on the door. She’s freaking out—what does a blue dot mean?.

5. Signs of Recently Completed Work
If a contractor was on-site—for carpets, wiring, lock systems, etc.—they sometimes leave tiny stickers on every door they inspected or passed. Not malicious; just lazy cleanup.

This actually happens more than you’d think.

❗ Now, Let’s Address the Scary Theories (and What’s Actually True)
Online, you may have seen warnings claiming:

“Stickers mark targets for trafficking rings.”

“Burglars use them to track when guests leave.”

“Criminals use color codes to communicate.”

These posts go viral because they’re terrifying. But they rarely come from verified law enforcement sources, and extremely few real cases support these claims.

Here’s the truth:

✔ Criminals don’t typically mark doors with obvious stickers, because it draws attention.
Criminal activity usually relies on blending in—not leaving clues.