
He probably has to say
that for LEGAL reasons.
The Big Bang Theory Season 11, Episode 12

No LEGAL proceedings have been initiated.
Money Heist Season 3, Episode 2

...of quod est necessarium est licitum,
that which is necessary is LEGAL.
The Big Bang Theory Season 3, Episode 16

You've been frequenting drinking
establishments since you were of LEGAL age.
The Big Bang Theory Season 6, Episode 4