"We have actually used Mohammad Amir (incident) at a very early stage. He did make a video for us before he admitted his guilt and described the effect that had upon him and how wrong he was," said ICC's Anti-Corruption Unit's chairman, Sir Ronnie Flanagan, at a media conference today.
Flanagan told reporters about the measures being taken by his unit to prevent corrupt practices marring the ICC World T20 Championships commencing in two days' time in the country.
He made a return to international cricket on January 15 following a five-year ban for Pakistan against New Zealand in the opening Twenty20 International in Auckland.
The fast bowler, now 23 years old, was found guilty and banned for intentionally bowling no-balls during the Lord's Test against England in 2010.
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Amir, who was convicted along with his team-mates Salman Butt and Mohammad Asif, was released from an English prison four years ago.
"When you investigate something, you present an evidence to court. In our case we present it to the tribunal. We do not decide as investigators what the punishment is. The independent tribunal decides upon that punishment.
"We have zero-tolerance of corrupt activity, but does that mean punishment should always be the same? I'll use the description in the criminal law....An assault is different from murder," he explained.