I suggest you take these rules with a grain of salt. But here they are in full courtesy of the Washington Post. It makes you wonder what crack team of detectives are monitoring the fireworks for sale on every other corner that are completely out in the open.
"Sparklers measuring 20 inches or less, torches, box fire, fountains, cones, dip sticks, non-poisonous snakes, paper novelty items, colored lights and paper caps are allowed. Any fireworks that move, explode, emit a flame greater than 12 inches, have a side-mounted fuse or fuse inserted along the product's surface, or contain highly oxidizing agents such as mercury or arsenic that the fire marshal considers to be dangerous to the safety of any person or property are not permitted."