taipeitimes.com/News/front/a ... 2003558093
This is what I found on Jeffrey Koo. Looks like prosecuters lied to get him to return to Taiwan, but it's inadmissible.
chinapost.com.tw/taiwan-busi ... -finds.htm
Ah, here we go. However, Chen was a public servant, Koo was a private citizen.
taipeitimes.com/News/front/a ... 2003561141
According to this article, violations of the Anti-Corruption Act carries a minimum sentence of 10 years. I'm fairly sure Chen violated that act. It hasn't been 10 years.
taipeitimes.com/News/taiwan/ ... 2003561335
I think Lin Yi-shih would be a better argument for you. Although, Chen was convicted on many more counts. So, yeah, I would agree they "threw the book" at Chen. All current and future ROC presidents should be forewarned.