This is from the US Customs and Boarder Patrol website: Bakery items, candy, chocolate, and cured cheese are generally admissible. Canned goods and goods in vacuum packed jars (other than those containing meat or poultry products)are also generally admissible if being imported for personal use.
In the airport.
If you disembark your plane; yes.
If you are arriving from Puerto Rico in a country other than the United States, you must go through Customs. If you are arriving in a US airport from Puerto Rico, for instance, if you are arriving in Miami, or New York, or Los Angeles, you are on a domestic flight and will not be asked to go through Customs. If you started in Puerto Rico, you started from within the US. If you started from another country, you went through US Customs when you arrived in Puerto Rico.
it is very hard to go through UK customs
eating chocolate eggs is one custom.
No because Canadian flights to Mexico go north over the north pole and over South America not south over the USA, {Just Kidding} no you do not have to go threw US customs on a flight from Canada to Mexico or vise versa.
No, imported mattresses do not have to go through customs because they are not considered a hazardous material.
to the airport
I had to go through customs at the airport
lo
No, he does not exist, on the other hand, someone dressed like Santa would have to go through customs and he better have a passport.
Certain foods are allowed through US customs, but many are not. Unpackaged foods, raw meats, fruits, vegetable, produce, un-packaged breads, ect. are not allowed in. Certain food dyes that are legal in other countries are not always legal in the US, too.