Sideline Warning?

[w_sohl]

To throw a flag or not to throw a flag, that is the question.

We had this discussion with a member of our crew on Saturday. He insists that on the WARNING you do not throw a flag because there is no yardage penalty assesed and that you would toss the flag on subsequent sideline infractions. The rest of the crew disagreed with him as we felt that the purpose of the flag is to indicate that an infraction has occured and has nothing to do with wether or not there will be penalty yardage assesed. If he is correct please cite reference so that I can see it with my own two eyes and relay the information to our crew chief.