"Bottom line? We (unknowingly) gave a guy a second chance... and he revived his criminal career in our building."

Same here. Perhaps that's why I'm so sensitive to this issue. Email has made things more transparent and corruption more difficult, but it's apparently still far too easy for people to dip their hands in the cookie jar and help themselves. Things are too lax, boards often have too many other responsibilities to be able to pay sufficient attention or apply sufficient scrutiny, it's just too easy.