do you have to redshirt transfers?

This is a basic question I can't remember the answer to.
I rarely take transfers. Ages ago I seem to remember taking two sophomore transfers who then played three years, but I also remember taking a junior transfer who was a senior by the time he was eligible to play and then was ineligible, so he never played a minute.
I rarely take transfers. Ages ago I seem to remember taking two sophomore transfers who then played three years, but I also remember taking a junior transfer who was a senior by the time he was eligible to play and then was ineligible, so he never played a minute.