On the same TSA page noting the ban on lighters is to be lifted August 4, is another notice that breast milk is good to go as well.

From their site:

Q. Why is breast milk not a threat?
A. Breast milk is a medical necessity and it is being classified as such. It must be declared at the checkpoint.

Q. Do passengers carrying breast milk need to taste it to prove it is not a liquid explosive?
A. No. We will not ask a traveler to taste breast milk.

The second question is priceless.

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