According to K.K Silva, "Vigilantes’ responses to perceived malicious activity have reportedly caused the loss of digital evidence, thereby obstructing law enforcement’s effort in ascertaining attribution and jurisdiction over cybercrime offences." Therefore internet vigilantism is generally in opposition to legitimate criminal investigations, and viewed as tampering with evidence. However, there are cases in which internet Vigilantism is legally protected, such as when it falls under laws relating to protection of the other. There have also been cases in which vigilantes have cooperated with criminal justice investigations, such as the cases of BrickerBot and WannaCry ransomware attack. In both of these cases, vigilantes cooperated with authorities, utilizing cyber crime methods to fight cyber crime and prevent further damage.