Exculpate

Exculpate is typically defined as something that attempts to justify a possibly wrong action.

Additional Sources

Answers.com

To clear of guilt or blame.

Duhaime Legal Dictionary

Something that excuses or justifies a wrong action.

FindLaw

To clear from alleged fault or guilt.

Lect Law Library

"To exculpate" means to free a particular individual from culpability after he or she has caused loss or damage and to represent this in a judgment that is either an acquittal or mitigates sentencing in the criminal law, or reduces or extinguishes the liability to pay compensation to the victim in the civil law.