Pakistan is a Muslim country in the midst of severe sectarian violence. Most of the laws reflect one or both of these things and the enforcement of them tends to be related to both as well.
Despite some wide spread drug use in various areas of Pakistan, the penalty for drug offences tend to be quite severe and do include the death penalty. Even possessing small quantities of "soft" drugs for personal recreational purposes can result in long jail sentences, heavy fines, deportation or all of them at once.
Pakistan also has the death penalty for serious crimes such as murder and rape, but it also includes blasphemy and unlawful assembly. So if a member of the police or security services informs you that you are, or are about to commit blasphemy, take it very seriously as the sentence may be death.
Certain forms of sexual conduct are illegal under Pakistani law. Homosexuality and sodomy are both illegal, with penalties ranging up to life imprisonment. It is also illegal for unmarried heterosexual couples to live together, although the punishment is not as severe as those for homosexual activities.
Importation of alcohol or pork related products is illegal in Pakistan, and yes, they do mean it.
If you think some of these laws are onerous, be very careful about what you say in Pakistan as attempting to convert a Muslim or encouraging one to abandon religion altogether is illegal.
It is rare, but corporal punishment is sometimes enforced for Muslims who commit such crimes as robbery, public drunkenness, and general consumption of alcohol.
There are certain things that aren't quite illegal exactly, but should be avoided. As in all countries experiencing violent outbreaks avoid taking photographs of airports, military and government buildings or installations or anything that might be considered sensitive.
Pakistan is a Muslim country, and general precautions should be taken because of this. Be careful not to offend the strict Islamic codes of dress and behaviour, this may cause unwanted attention from both the populace and the police. Take care to wear long sleeved garments at all times, and avoid physical contact between men and women in public.
Sadly, women may be targets of harassment, and especially so if they are unaccompanied.
Lastly, during Ramadan, eating, drinking and smoking between sunrise and sunset is forbidden to Muslims and while technically not illegal for non-Muslims, is something that should be avoided in public just to stay on the safe side.
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