Julian was justifiably paranoid, thank you. In his timeline, he'd been accepted--even if his enhancements coming to light also brought him some unwanted attention. He couldn't expect that here, and he could also cause ramifications for his earlier self--which would certainly affect his timeline.

"Don't worry, it's not a 'clap him in irons' type of illegal. It would preclude you from joining Starfleet, but you have your own ship to go back to. You might get a bit of a reaction from the rest of the Terran crew should they know, but not anything to worry about."

Julian smiles, as if he isn't talking about himself as well.

"It's fair, I'm actually not from this timeframe either."