BOULDER, Colo. (AP) — An anti-fracking activist ticketed for projecting a skull and crossbones onto the wall of a Colorado courthouse argues his actions broke no law and were protected by the Constitution.

The Daily Camera reports Boulder police cited David Paul for trespassing after officers say he beamed a skull and crossbones along with the words "Ban Fracking!" onto a courthouse building. The building houses Boulder County government offices.

Paul is asking the judge to throw out the case.

Boulder County Attorney Ben Pearlman directed police to issue the ticket, saying the county doesn't allow images or phrases to be beamed onto the building.

Fracking uses a high-pressure mix to loosen underground formations and release oil and gas. Industry officials say the technique is safe.

Paul is scheduled to appear in court Monday.

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Information from: Daily Camera, http://www.dailycamera.com/