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... The 27-year-old Army veteran, wearing sunglasses and a Hawaiian shirt, thought he had spare time to grab some paperwork from the Department of Veterans Affairs. While listening to music on his headphones, he took a shortcut around the Wilshire Federal Building by brushing past some police tape.

Shortly after crossing through the federal building complex, he saw a service member yelling at him to get back on the other side of the tape, and he quickly complied.

After presenting his identification card at the front walkway to the VA building, he continued on his way. Then, as the song "Someday" by Flipsyde floated in his ears, he saw a Marine shouting at him to get on the ground.

Soon, his wrists were being zip-tied, and he was held by the Marines for what he estimated was nearly two hours before being handed off to LA police.

"I was like, 'This is ridiculous,'" Leao recounted to Military.com on Wednesday. "Now, there's a miscommunication, a big miscommunication."

Leao's detention by Marines on Friday marks what many legal, defense and policy experts say is an unprecedented violation of the Posse Comitatus Act, which bars the U.S. military from performing domestic law enforcement. While the Pentagon claims the detention was legal, others -- including several experts who spoke with Military.com -- have cast doubt on the incident. ...