The controversial subject of illegal bowling actions has always been an emotive issue in cricket.
Shabbir has been reported twice to the ICC in the past nine months
Pakistan's Shabbir Ahmed has been given a 12-month ban from bowling in international cricket because of an illegal action.
So what constitutes a suspect action, and what are the implications for bowlers who are found to have broken the ICC guidelines?
WHAT IS A LEGAL ACTION?
Law 24.3 states:
"A ball is fairly delivered in respect to the arm if, once the bowler's arm has reached the level of the shoulder in the delivery swing, the elbow joint is not straightened partially or completely from that point until the ball has left the hand.
"This definition shall not debar a bowler from flexing or rotating the wrist in the delivery swing."
WHAT IS A THROW?
"Chucking", as it is commonly called, is when the elbow plays a significant role during the point of delivery.
A straightened elbow can give the bowler the unfair advantage of generating extra speed than if the ball is delivered with a straight arm.
However, most bowlers' arms will straighten because of the sheer forces going through the body at the point of delivery.
The ICC has now set a maximum limit of 15 degrees of flex, which means that no bowler can extend their elbow beyond that level.
WHO SET THE 15 DEGREE LIMIT?
The ICC Cricket Committee commissioned a number of former international cricketers to develop a set of new regulations.
Seven former internationals sat on the panel. They are:
Sunil Gavaskar: Former India batsman now ICC committee member
Michael Holding: Former West Indies fast bowler now cricket commentator
Tim May: Former Australia off spinner now chief executive of FICA, the Federation of International Cricketers' Associations (FICA)
Aravinda de Silva: Former Sri Lanka batsman now national selector
Tony Lewis: Former England captain and chairman of the MCC cricket committee
Angus Fraser: Former England fast bowler now journalist
David Richardson: Former South Africa wicket-keeper now ICC General Manager of Cricket
Their recommendations were supported by the ICC Cricket Committee and then approved by the ICC's Chief Executives Committee.
They were brought into practice on 1 March 2005.
WHY IS 15 DEGREES THE MAXIMUM LEVEL?
"That is the number which biomechanics says that it (straightening) becomes visible," said panel member Fraser.
"It is difficult for the naked eye to see less than 15 degrees in a bowler's action.
BOWLERS REPORTED SINCE MARCH 2005
Harbhajan Singh: India
James Kirtley: England
Jermaine Lawson: West Indies
Pakistan's Shoaib Malik and Shabbir Ahmed reported twice in the past nine months
"We found when the bicep reached the shoulder the amount of bend was around 165 degrees. Very few bowlers can get to 180 degrees because the joint doesn't allow that.
"It's difficult to prevent that happening, but once you go further than 15 degrees you get into an area which is starting to give you an unfair advantage and you are breaking the law."
WHO CAN REPORT A SUSPECT ACTION?
The initial call can only be made by the on-field umpire or the ICC's match referee using the naked eye.
Both the umpire and the match referee will mention the suspect action in their match report, which is then sent to the ICC.
However, neither match official needs to specify the degree of straightening involved.
WHAT HAPPENS NEXT?
The bowler in question will then be given 21 days to report to the ICC's Human Movement Specialist panel.
The panel consists of four leading independent biomechanics experts based at four centres around the world.
Biomechanics is the study of human movement which involves complex computer technology to analyse bowlers' actions.
The ICC experts are:
Professor Bruce Elliott, University of Western Australia (Perth)
Marc Portus, Australia Institute of Sport (Canberra)
Professor Tim Noakes, Sports Science Institute at the University of Cape Town (South Africa)
Dr Paul Hurrion, Quintic Biomechanics Consultancy (Coventry, UK)
If a member of the panel finds that the bowler's action strays beyond the 15 degree limit, the bowler will be suspended from all forms of cricket.
WHAT HAPPENS IN BIOMECHANICAL TESTING?
A bowler will be wired up with a series of reflectors which are connected to a central computer. It converts their bowling action into a 3D image.
Shoaib Malik was fitted with reflectors to assess his action
This image can be broken down into a skeletal form, from which the experts can isolate the movement of the arm at the point of delivery.
From here, they can measure the angle of the elbow straightening and record whether it is above or below the 15 degree limit.
CAN BOWLERS ADJUST THEIR ACTION IN TESTING?
The member of the panel assigned to work with the bowler will receive video copies of the match from which the bowler was reported.
This means the expert will have another point of reference along with the bowler's action from the laboratory testing to measure any changes.
If the expert feels the bowler is not replicating their action from match conditions in the laboratory, they have the authority to recommend the bowler be suspended.
IS THERE A WAY OF GETTING ROUND THE 15 DEGREE LIMIT?
No. However, if a bowler exceeds the 15 degrees for a particular type of delivery but all their other variations are perfectly legal, they can be warned that they face further reporting if they choose to use this delivery during an international match.
CAN A BOWLER APPEAL IF THEIR ACTION IS DEEMED ILLEGAL?
Yes, they can request a hearing with the ICC's Bowling Review Group (BRG).
The BRG has the power to uphold or overturn a bowler's suspension. If it decides to uphold the suspension, the bowler will not be able to participate in international cricket until their action has been successfully altered.
WHO SITS ON THE BRG?
The panel consists of:
A member of the ICC Code of Conduct Commission (chairman)
A current ICC match referee
A former international player
A former international umpire
A member of the ICC Human Movement Specialists
ICC General manager
The panel is not permanent, which means the six members who convene proceedings will change depending on the bowler's nationality.
WHAT IF A BOWLER IS REPORTED A SECOND TIME?
If the bowler is reported twice within a two-year period and found to have broken the 15 degree limit on both occasions, they will be suspended from international cricket for a minimum period of a year.
Only after serving the suspension will the bowler have the opportunity to have their action reassessed by the ICC.
WHO PAYS FOR REMEDIAL WORK?
The initial assessment by the Human Movement Specialist panel after the bowler has been reported will be paid for by the ICC.
However, if the bowler decides to appeal against the Human Movement Specialist panel's decision, they or their national governing body must pay for further reassessments.