Does a GK perform better when playing with a certain formation?

If you use Marijuana in a country where it is legal whereas it is illegal in your home country, will it be considered as a crime?

In a case where Marijuana is illegal in your country and you used Marijuana in a country where it is legal, is it considered as committing crime and will you be held liable when it is detected that you used Marijuana in another country when coming back to your home country?