Those violating Hungarian laws, even unknowingly, may be expelled, arrested and/or imprisoned. Penalties for possession, use or trafficking of illegal drugs in Hungary are severe, and convicted offenders can expect long jail sentences and heavy fines.
There is a 100% ban on alcohol when driving and it is taken very seriously. Police conduct routine roadside checks with breathalysers and if you are found to have even 0.005% of alcohol in your blood, you could be fined up to 300,000Ft on the spot; police have been known to fine for less than that, so it's best not to drink at all. In the event of an accident, the drinking party is automatically regarded as guilty.