The parents of a 6-year-old boy who has been missing since last Tuesday are willing to submit to FBI polygraph examinations to prove they had no role in their son's disappearance.

Lance Guevarra was last seen leaving a neighbor's trailer home in this tiny Kane County community near the Utah-Arizona border and Lake Powell."There's nothing wrong with that. . . . We're just trying to do our best to, you know, get him home," said a tearful William Guevarra, the boy's father.

Lance's mother, Kimberly Guevarra, said FBI agents entered the search for Lance on Friday and had planned to give her and her husband polygraph exams within a week. She, too, welcomes the exams.

The 3-foot-10-inch boy, who celebrated his sixth birthday Aug. 4, had spent Tuesday afternoon playing at a mobile home across the dirt road from his own home.

He left well before dark and stopped at another neighbor's trailer home, which is just 50 feet from the Guevarra home. Around 8 p.m., he left the Bybee home, promising Alex Bybee, 17, that he would return with a Nintendo video cartridge he had borrowed.

But Kimberly Guevarra said the boy, who was not wearing a shirt or shoes, never made it back.

Tracking dogs with the Rocky Mountain Rescue Dogs team found "no signs of abduction, and there's no sign that he walked out into the desert," said spokesman Dave Perks.

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Kimberly Guevarra suspects someone drove by and took her son. Though drivers have to get off nearby U.S. 89 to enter Big Water, she said strangers in town aren't uncommon: Tourists headed for Lake Powell often stop by to see polygamists who live there.

Meantime, the Guevarras sent a photograph and information about Lance to the National Center for Missing and Exploited Children, which distributes information on missing children nationwide.

"The more I get his face out, maybe someone will see him," Kim-berly Guevarra said.

On the forms, she explained how Lance is missing a front tooth and was scheduled to enter the first grade in the fall.

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