The police investigation into a street brawl in Osaka in 2013 that resulted in a fine for a Filipino-Japanese man was superficial and should never have caused charges to be filed, a court in Osaka has ruled.

In a rare ruling, the Osaka Summary Court decided to exempt the 23-year-old defendant from punishment despite finding him guilty of assault, after hearing that the police failed to provide him with a Tagalog interpreter. The man can only speak limited Japanese.

According to the ruling, two drunken men began a quarrel with the defendant on a street in Osaka in June 2013. When one of them grabbed his collar, the Philippine-Japanese man punched him in the face, causing a broken bone.

Neither of the drunks was indicted. But the court initially ordered the Filipino-Japanese man to pay a ¥300,000 ($2,500) fine in January 2014. The defendant filed a complaint and sought a formal trial, leading to a ruling that effectively canceled the fine on Feb. 26.

The ruling was finalized on March 13 after the appeal period expired.

"This is de facto innocence," said Masanori Matsuoka, the defendant's lawyer. "It's an excellent ruling that criticized the investigation of a man who cannot speak Japanese sufficiently."

Judge Akinori Hatayama said it is unfair to punish only the Filipino-Japanese man, given that the drunken man was not indicted for assault.

The judge criticized the prosecutors for charging the defendant without properly considering the case and based purely on the degree of physical injury that resulted from the scuffle.