Scoring System+Timer

I would like to know how to keep the score the same after the timer has run out? I already know how to display both the timer and score, but how do you keep a players score the same after the timer has run out? I was still able to score 10 points on my demo after my time was up.
Comments
Then, have a rule that says:
If timerActive is true, and player does something that gives him points, give the player some points!
On the timer, have a rule that says when timer runs out, change timer active to false.
That way you only get points while the timer is active.
Make sense?
Hope that helps,
QS