Penalties and repair costs used as "Tax Write Offs"

This is part a report I heard on CBC radio while I was driving to work today. Unfortunately, I reached the destination before the report was finished.

Apparently, some big Canadian industries who were (and are) convicted on environmental charges, had (and have) to pay some penalties as well as repairing the environmental damages they had (and have) caused. So, they have been paying the penalties and making the required repairs like "law abiding citizens".

BUT, they have also been (and are) using the same penalties and the cost of repairs against their taxes and as "tax write offs". This practice still exists in Canada by the big corporations and the government is not stopping them. Not very fair, is it?