Diane Tirado was a teacher in Florida, but she was let go because she gave her students a 'zero' for not turning in their homework.
The school's policy says teachers are not supposed to give any grades lower than 50%.
There's more to this, as the school said she was not just fired for giving out zeroes, but for being 'defiant.'
Sounds to me like she was using her 'common sense' but check out the rest of the story HERE and decide for yourself.