US Marshals searching for sex predator, Matthew Caulk, who's on the run for 2nd time in 2 years

U.S. Marshals are searching for a wanted sexual predator who is on the loose for the second time in two years.

Matthew Caulk, a convicted sex offender, is wanted for violating his probation. He has prior sex crime convictions in Colorado and Washington state.

Caulk was released from federal prison at the end of January and quickly disappeared. He was fitted with a passive GPS device, which tracks where you've been, but not where you are.

Passive GPS devices need to be docked to a device so the tracking data can be uploaded. By comparison, an active GPS device can reveal your real-time location.

In February 2013, Caulk violated his probation when he disappeared while also wearing a passive GPS device. He was found within a week at an Aurora home and re-arrested.

Caulk was held in custody until his trial because a judge decided, "(Caulk) has failed to establish by clear and convincing evidence that he will not flee and that he will not pose a danger."

In October 2013, he was sentenced to federal prison for failing to register as a sex offender. He was released on Jan. 24.

7NEWS wants to know why he was given a passive GPS device again, when it did not keep him from running a year ago?

Calls to federal probation officers have not been returned.

U.S. Marshals think he may be traveling with an underage girl. They warn that he uses fake credit cards and identification. He also has numerous aliases and may have grown facial hair.

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