That doesn't mean, however, that a U.S. ban on Iranian imports would have reduced Iran's oil revenues very much.

Early reports blamed Mexico, whence the strawberries came in violation of the U.S. ban on foreign ingredients in school lunches.

In 1988, the first U.S. ban of general polystyrene foam was enacted in Berkeley, California.

Inevitably, some of its decisions can be challenged: Was the U.S. ban on dolphin-unsafe tuna really a trade barrier in disguise?

For example, the U.S. ban on the import of agricultural products has caused deep unemployment among blacks in the Cape Province fishing industry.

This led to a 1948 U.S. ban on the transfer of all classified information to Australia.

International Report Chile's fruit export business remains in limbo because of the temporary U.S. ban on sales after cyanide-tainted grapes were found.

The minimum thickness for a reusable plastic bag under the San Francisco ordinance is 2.25 mil (57 m) and most other U.S. bans have followed this standard.

How do these targeted killings not violate the U.S. ban on assassinations?

On February 20, 1970 Nixon added toxins, regardless of their means of production - be it chemical or biological, to the U.S. ban on biological weapons.