Boulder residents who intentionally leave their doors open, may unintentionally be inviting a Boulder police officer in for a visit.

Chrissy Smiley learned this fact in surprising fashion on Thursday afternoon when she returned to her south Boulder condo after a 40-minute walk with her dogs to find a card from a Boulder police officer sitting on her dining room table.

Disturbed by the discovery, Smiley said she quickly called the officer back to ask why he had entered her home without her permission.

"He was very nice. He said he had come back to follow up on another officer who had been there for something and he felt he had probable cause to make sure that I was safe," Smiley said, adding the she found the officer's explanation unsettling.

(Hat tip to Reason commenter Andrew S.)