DENVER -- The graffiti on the sign outside the Boulder County Justice Center has been there for four days, but only now have authorities caught onto the vandal's irony -- and they are not amused.

Using what appears to be stencils and white paint, someone added quotation marks around the word justice on the facility's main sign.

According to the Daily Camera, the graffiti appeared sometime late Sunday night.

It went unnoticed by attorneys, prosecutors, judges and police officers who walk past the sign daily.

Attorney Stan Garnett was less amused when he saw the quotations for the first time Wednesday afternoon.

"I'm quite proud of the work that happens at this center," he told the Camera. "So to suggest on the official sign that it's not justice is not appropriate."

Garnett said he thinks someone disgruntled at the court system might be to blame.

"From time to time, people are disgruntled with a particular result, and that's understandable," he said. "But it doesn't mean it's not justice."

The sheriff's office will work with the police department to try to find the vandals.