It was speculated in some quarters the ICC would increase a spin bowler's level of tolerance - the extent to which he can straighten his arm - from five degrees to the paceman's amount of 10.

BBC: Muttiah Muralitharan

Law 23.4 originally stated that the arm couldn't straighten during delivery at all, but in the 1990s, when technology allowed for detailed analysis, it turned out that almost everyone's arm straightens a little bit.

WSJ: Cricket's 'Chucking' Challenge