Yes, but you can't carry them on your hand luggage or you can be detained for carrying a deadly weapon.
Yes, it is legal. Trainers do not have blades and do not fall under the category of knives.
Whether the question is asking about the State of Washington, or Washington, DC - the answer is the same for both. No, they are not legal. They fall under the classification of a 'gravity" or 'butterfly' knife which are unlawful.
no, in any way shape or form. not at all ditto with push knives and switchblades
None. Weapons and ammunition are illegal in Mexico.
As far as ive heard, No
As of May 2014, it is still legal in Mexico.
if you want to have a raffle is it legal in state New Mexico
no it is not legal
If the marriage is legal in Mexico, it will be held legal in the US. However, it is not legal for anyone under the age of 16 to get married in Mexico.
The legal age to drink in Mexico is 18 years old.
Butterfly knives, also known as balisongs, are not illegal in Texas. However, it is illegal to carry them with intent to harm. You can also go the safe route and get a balisong trainer--they are legal everywhere.
No.