Answer:
What can be heard in court or used to carry briefs?
You use me between your head and your toes the more I work the thinner I grow.
I am owned by Old McDonald.
Sing me to a baby about to go to sleep.
I am black when you buy me, red when you use me. When I turn white, you know it's time to throw me away. What am I?
Keep doing me to avoid lens dryness