A'supergrass" is someone who participates in some way in criminal or terrorist activity, reports it to police, and agrees to testify in court against the 'bosses' who planned it or accomplices who participated.Supergrassesare not typical street corner'snitches.' They are either undercover agents or former 'organization' members who were previously turned by the police in return for immunity from prosecution, witness protectionor reduced sentence.How does the use ofsupergrassesbecome problematic for the justice system? Do the endsjustifythe means?