Well, I'd like to walk up to some of the kids I coach and say "Go and tell mum and dad to get some medical tests done on you to prove you have a natural flex in your arm".
"OK Cam, but I think mum and dad wanted to spend the stimulus package money on a new TV. I think I just won't bowl/ play any more".
That's not practical at all. Maybe at higher grade levels, but what about people who play in the park (which is the vast majority in Australia at least)?
Do you never call anyone for throwing?
You asked me what happens at the levels below FC cricket and that effectively happens. Especially for guys like Bird and Murali that are a class above and have to potential to make it all the way.
For you average hack park cricketer, that will never be more then average. I'm sure they will get no balled, or be told during or after the game that can't bowl. Something that actually did happen in Bird case, at Taree youth rep level. But they came back and showed he had flex. Then he was able to continue on, then got it tested again once he NSW youth level, then Australian youth level and then again at NSW FC level.
But effective the test on any flex on his arm, was the first test he got done at basic park level.
Not saying you should never call anyone at park level or juniors. But if they are any good or their parents are very keen. It wouldn't surprise if they went down the same path as other have done before and tested their arms for flexs.
Would be very hard to throw someone out at park cricket if they had a flex and wanted to continue, or there was others that wanted them to continue playing. There too much evidence in there favour to show that they aren't throwing and it just an optically from the naked eye.
If Botha and Amjal both pass. The belief that you can see a bowler through the naked eye flexing more the 15 degrees may get thrown out the door as well. It may have to be based on live testing.