Technically speaking, the cows were checked, but too unreliable way. The cows were checked if radioactive materials were sticked to their skin or not, and hearing investigation was conducted. The farmer who sold the cows told to the investigator that they obey the guideline. I have to think Japanese government must have no idea that not-potician citizen can tell a lie and cows can be showered.
Anyway a lot of cows' images have appeared on tv monitor, news site, etc.etc. Watching living cows going to become meat is disgusting.
I have not eaten cows more than 15 years intentionally. It is not easy to avoid eating cow. Cows are used in many foods. Beef fat, gelatin etc. etc are used in many cooking.
The each reason is quite different but I don't want to eat radioactive food as well as dog, cat, cow, etc. etc. etc.
I am sorry Japanese children have to eat radioactive food and cows through their school lunch.