As young kids when we played cricket, the competition was always intense. No quarters given, no favours demanded. I remember very clearly two players from our team who were prevented from bowling as their actions aroused suspicion of the other teams we played matches with.
There were no cameras, no biomechanics, no electrodes, no trigonometric measurements — just the knowledge (not backed by overt admission though) that the bowlers' actions were not entirely defensible.
It becomes very clear to anybody who has watched the game for sometime, as to what is a good shot, and what is a bad shot. The same is true for the other player activities — fielding and bowling. You just KNOW, when it is good and when foul.
I have no doubt in my mind that the bowling actions of the following are (or have at a point of time been) foul:
They have either been 'throwing' — which involves the bowling arm being recoiled/flexed and then straightened out to generate a certain pace that would not normally come if the bowling arm were to be swivelled around the shoulder while at full stretch — or 'slinging' the arm in a slanted angle — where the bowling hand doesn't go high above the bowler's head at full-stretch. In the case of Malinga for example, the bowling arm is mostly at par with the level of the shoulder.
It doesn't take anything more than basic cricketing sense to endorse the above list of the defaulters.
What further obfuscates the issue is that the chucking debate centres around 'straightening' of the bowling arm. While in reality the problem is in 'bending' the bowling arm, which the bowler would then automatically straighten. You don't need to straighten your arm if you don't bend the damn arm in the first place!
And as if the misplaced debate were not enough, we have to contend with the absolute stupidity of ICC putting limits and measurements like eight degrees, thirteen degrees, fifteen degrees etc. and that too in exotic biomechanics laboratories! It is a hallmark of incredulous dodo-headedness that they don't think that the bowlers in question could bowl legitimately in the lab and sneak in the dirty ball during crucial moments in the match. (The biggest exponents of this are Shoaib Akhtar and Shahid Afridi).
Could the ICC stop this nonsense? Let the square-leg umpire call. For he, just like the rest of us, would KNOW when a bowler is chucking.
Like pregnancy — where you either are pregnant or you are not — chucking too is binary. You either chuck, or you don't. And there can be no measurements to it.