Computer, one hundred Nazis, fully dressed with weapons but the weapons dont work.
computer noise
Computer, one fully grown T-Rex.
computer noise
Oh, almost forgot. Computer, give the tyrannosaurus a saddle and reins so I can ride it into battle.
computer noise
Run program.
The Federation, especially Earth, has a strong taboo against any kind of transhumanism as a result of cultural trauma from the Eugenics Wars. This is most obvious in the ban on augments, but it goes a lot wider than that, including prejudice against Ilyrians (like
spoiler
Una Chin-Reilly
), synthetics (like Data), and engineered hybrids (like
spoiler
Dal R'el
).
Apologies for the messy spoiler tags.
But I bet there are A Lot of weird bodymods and enhancements right on the margins of Federation space. It's canon that it's possible to permanently modify a humanoid to visually pass as another humanoid species (e.g.
spoiler
Arne Darvin
), and at least temporarily to pass moderate medical scans. I would think a Human wanting to become a Caitian could probably not be legally accommodated within the Federation, but it wouldn't be impossible.