Screening Rules if you knew or didnt:
You can carry on small amounts of liquids, but you must follow what TSA calls the 3-1-1 rule: 3.4-ounce container(s) or smaller, in one quart-size clear plastic zip-top bag, one bag per passenger. Medications, baby formula and food, and breast milk are allowed in reasonable quantities exceeding 3.4 ounces, and don’t have to be in the bag. Declare these things at the checkpoint. Officers may open some or all of them to screen them.
The 3.4 ounces applies to the container. Larger containers that are partly filled and large toothpaste tubes that are rolled up aren’t allowed. What’s a “liquid”? Use this informal rule of thumb: If you can pour, pump, squeeze, spread, smear, spray and/or spill it, it’s a liquid. Pastes, ointments and mascara are considered liquids.
Frozen food is considered a solid. If it’s partially melted — “such as gravy,” TSA’s website says — it’s liquid, and subject to 3-1-1.
Snow globes and other tchotchkes containing liquid are prohibited, “even with documentation.”
Gel shoe inserts are forbidden onboard aircraft. Gel-filled bras are allowed. Children 12 and younger may now keep their shoes on.
Scissors with blades shorter than four inches, even with pointed tips, are now allowed. Ice skates — despite having potentially long, sharp blades — are allowed. Screwdrivers seven inches long or shorter are allowed, perhaps surprisingly, as are wrenches and pliers seven inches long or shorter.
Common lighters are O.K., as is one book of safety (non-strike anywhere) matches.
Passing through electronic detection equipment is optional, though TSA assures it is safe for all, including pregnant women. Those opting out will be searched via pat-down.
http://abcnews.go.com/blogs/lifestyl...reening-rules/