Derek Carr practiced today.

woohoosaint said
2 concussions within a 22 day period...and the team isn't stepping in to say enough is enough?!?

I've been looking. I haven't seen any hard rules about how many. This doctor recommends sitting it out after your third in a season.

https://www.nfl.com/news/dr-elizabe...te who begins to,three concussions in a year.