Oh, get real! What if it's really medication, and you already took your dosage for the day? Should you take another swig and overdose, just to satisfy some security notwit on a power trip? What about your shampoo? Should you try some of that, too? After all, we can't be too safe, can we?
In this particular case, the bottles of breast milk had already been through the x-ray machine. Nothing was hidden in the milk. The TSA's own rules say (since June, anyway) that passengers do not have to drink from closed containers.
This was abusive, plain and simple. Stop making excuses for these people.
Bruce