Pressure is set to intensify on umpires to call no-balls correctly on the field after Pakistan teenager Naseem Shah had been denied his first wicket for overstepping.
The 16-year-old had David Warner caught behind for 56 shortly after lunch at the Gabba on Friday's second day, before the third umpire via replays ruled he had overstepped.
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However, it came after several other front-foot no-balls from the debutant had been missed earlier in the day by on-field umpire Richard Kettleborough.
"Of course, a no ball is a no ball," former Aussie quick Trent Copeland tweeted.
"But, the WORST part about regular no balls not being called is - how is the bowler supposed to know?? And then, when it matters most - it's too late?"
Several former players argued that had Naseem been called earlier, he would have adjusted his run-up by the time he had Warner edging.
According to the Seven Network's replays, a startling 21 no-balls were missed by on-field umpires in the first two sessions of Friday's play across all of Pakistan's quicks.
Just one was called correctly on field.
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It came after Pat Cummins claimed the scalp of Muhammad Rizwan, caught behind on Thursday, before replays showed he had appeared to overstep.
On that occasion, third umpire Michael Gough controversially ruled the delivery to be a fair ball.
The International Cricket Council announced in August a six-month trial in limited-overs matches in which the TV umpire would adjudicate on all no-balls.
In turn, they would communicate the information to on-field umpires within seconds regardless of whether it was a wicket-taking delivery.
A similar trial was held in 2016 when third umpires would signal, onto an umpire's watch on field, when a no-ball had been bowled.
However, it's believed the costs and logistical hurdle of implementing the technology across the world stopped it progressing further.
Former Aussie Test quick Peter George has also invented a device that goes on the back of the bowler's shoe to alert umpires if a no-ball has been bowled.
George expects his "MyCall" device, which uses a detector on the crease and chip on the bowler's shoe, to be ready late next year for commercial use.