there's no law against it

there's no law against (something)

It is perfectly acceptable to (do something). Typically said in response to criticism of or a warning against some action. Why shouldn't I try to haggle with the waitress? There's no law against it. There's no law against returning something I've already worn. Stop trying to make me feel bad about it.
See also: law, no
Farlex Dictionary of Idioms.

there's no law against it

used in spoken English to assert that you are doing nothing wrong, especially in response to an actual or implied criticism. informal
See also: law, no
Farlex Partner Idioms Dictionary
See also:
  • there's no law against (something)
  • there's no law against something
  • haggle
  • haggle about
  • haggle about (something)
  • haggle over
  • haggle over (something)
  • dicker
  • every man to his taste
  • (all) well and good