But former murder squad Detective Chief Inspector Pete Kirkham believes stun guns have become the weapon of choice for many criminals.

BBC: Stun guns bought via mail order come through UK Customs

There are eight categories of weapon, ranging from automatic hardware and machine guns which are prohibited, to hunting equipment allowed with a hunting permit.

CNN: France: Where fear and taboo control guns more than laws

Even if not directly threatened with a weapon, many students are nonetheless aware of the presence of guns and knives on their campus.

CNN: How to deal with guns in school