Something I have often thought about in respect of limited overs cricket in particular. By way of example I pose this hypothetical situation, imagine a 50 overs per side match. The game is a tight one, it's the end of the 47th over, opposition needs 14 runs to win, 3 overs to go. Captain of the fielding side has a Glenn McGrath type bowler who can bowl tightly and economically at the end of an innings. Captain has held back this bowler to bowl the 48th, 49th and 50th overs. Is there anything in the laws to preclude this from happening?
I know that bowlers bowl alternate overs, but I was wondering if this is purely a traditional thing or whether there was anything in the laws that actually forbid a bowler bowling consecutive overs.

