All milk in U.S. is antibiotic-free

I grew up on a dairy farm, spent 10 years in biotech/pharmaceutical and am now employed at a dairy plant. Recently, I was surprised to learn that a very smart and well informed friend of mine wasn't aware of what is involved with drug residue (antibiotic) testing of the milk supply. If this intelligent friend of mine didn't know, I started wondering how many other people don't know. Consumers have a right to know their food is safe.
I am not "anti" organic. People have a right to choose what they feel is right for themselves. I am a proponent of informed decisions.
On a conventional dairy farm, when a cow requires antibiotics, it's milked separately from the main herd and the milk is not sent to the processing plant. When the milk is free from antibiotics, the cow can re-enter the milking herd. On an organic farm, if a cow requires antibiotics, she is permanently removed from the herd.
Milk is one of the most heavily regulated foodstuffs available: regulated by the PMO, FDA, USDHHS and PHS. All milk, not just milk from farms certified organic, is antibiotic-free. When the milk truck driver picks up milk at an individual's farm, a sample is pulled from each farm. When the milk arrives at the milk plant, the very first thing that occurs is a drug residue test, which is very accurate and very sensitive - test results are measured in parts per billion. If the truck tests positive, then we go back and check the individual farm samples to see what farm is responsible for the "hot" load. That farm then becomes responsible for all costs incurred with the dumping of that milk because milk with antibiotics is not allowed in the U.S. food supply.
Farmers drink milk, too!
Valerie Moss-Deegan