Botha's doosra has Perth chucking mad

Adelaide Strikers captain Johan Botha's controversial bowling action has come under more scrutiny after he delivered two doosras - his ball outlawed by the ICC - during the win over the Perth Scorchers on New Year's Eve.

Botha was banned from bowling doosras in 2009 after testing at the University of WA revealed that he could not deliver the unorthodox ball without bending his arm more than the allowed 15 degrees.

But the South African twice used the delivery in Perth's innings during the match at Adelaide Oval on Tuesday night.

Television commentators Adam Gilchrist and Tom Moody referred to Botha using the doosra while delivering to Scorchers player Nathan Coulter-Nile.

Match referee Daryl Harper was alerted to Botha's use of the delivery during the match though Cricket Australia said the bowler had not been the subject of an official report after the game.

Botha was reported twice while playing for South Australia during the Ryobi Cup tournament in October - with eight separate deliveries being identified as suspicious - but was later cleared to continue bowling after testing at the Australian Institute of Sport.

WA players and officials were also furious umpires Ian Lock and Ashley Barrow did not report Botha after the Sheffield Shield match at the WACA Ground in November when he made changes to his action to deliver his deadly faster ball.

One interstate coach told cricket officials recently that bowlers with suspicious actions were being coached to pass the testing protocol.

Botha would have received a three-month ban had any of his test deliveries at the AIS been measured above 15 degrees.

Australian coach Darren Lehmann, while Brisbane Heat coach, was reprimanded last season for questioning the action of West Indies import Marlon Samuels.

Strikers and SA coach Darren Berry, a staunch defender of Botha, was also charged but cleared after a spat with Samuels sparked by the bowler's action.

Samuels was tested at the University of WA last month after being reported in India but was cleared - unlike his colleague Shane Shillingford who was suspended for chucking.