(in the US) Yes, unless your travel is restricted by court order or the conditions of your release.
no
no. crimes of moral turpitude perminantly exclude you from USA
half the kids in london under the age of 16 have a conviction for possession of cannabis, of course you could go!
Travelling to New Zealand with a simple possession charge is probably OK but you should contact the New Zealand embassy to be sure.
Unless a knowledgeable Australian chooses to answer this question - I suggest that the simplest way to find out is to call/contact the Australian Embassy and simply ask.
5 years
Every 45 seconds in America
You can travel to some foreign countries after a DUI conviction, but it varies according to the country. You cannot enter Canada from the US with a DUI conviction.
Can I travel to the Bahamas with a felony conviction
State police have officially been instructed to adhere to state laws and not favor federal laws. While you may be hassled by some officers that are ignorant to the law, you cannot be arrested for possession of cannabis if you are able to present proper documentation from your doctor. God bless America.
In the UK, cannabis is a class B drug. Possession is 5 years imprisonment and an unlimited fine. Supplying is 14 years imprisonment and an unlimited fine.
No, even the possession of a firearm of any kinda is a felony.