TIJUANA, MEXICO (CNN) - A U.S. Marine Corps reservist being held in Mexico on weapons charges was sent back to prison Wednesday.
He's been imprisoned since March 31, when he drove into Mexico with three firearms in his truck.
He's maintained that he took a wrong turn on the California side of the border into Tijuana.
Emerging from Tijuana’s federal courtroom after an unexpectedly long hearing Andrew Tahmooressi got into a prison van and was driven back to El Hongo Prison outside Tecate.
His lawyer, Fernando Benitez, described Thursday's hearings as a success as he briefed reporters at the end of the day.
"It was finally and officially discovered that there are multiple irregularities with the order to search his vehicle, his conveyance. To site a couple, his order to search conveyance is dated three days before his crossing of the border,” Benitez said. “Number two, there are 11 pages missing from the record. Nobody seems to know what they are or what they say. Number three, it was proven that he did not have an adequate translator present. He wasn't afforded the right to council within the customs area."
"I just left Andrew right now so I was able to talk with him for twenty minutes,” said Jill Tahmooressi, the Marine’s mother. “He's strong, he's confident, he's very privileged to have Mr. Benitez defend his innocence."
The next hearing is scheduled for Aug. 4. Andrew Tahmooressi's defense will almost certainly hinge on what happened in those hours after his arrest along the U.S./Mexico border and how much of his testimony that he outlined Thursday can be deemed as credible.
Mexican authorities say ignorance of the law does not excuse responsibility.
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