A review of pending criminal cases investigated by a former Clark County sheriff’s detective shows that no further cases are compromised, according to the county prosector’s office. But because he could be facing criminal charges himself, former detective Kevin Harper will no longer be called to testify for the prosecution at trials. “Honestly, he’s just not a viable witness,” Clark County Chief Criminal Deputy Prosecutor Camara Banfield said. Even so, Banfield said nearly all of the criminal court cases that he investigated are still moving forward. Prosecutors have finished reviewing the cases Harper was involved in investigating and aside from dropped charges in an attempted murder case, all other unresolved criminal cases he investigated are viable, she said. Harper, who was a major crimes detective with the sheriff’s office for 20 years before he resigned earlier this month, was placed on administrative leave in September when a Vancouver police sergeant was made aware of an affair Harper was having with a known heroin addict, according to an investigation by the Washington State Patrol. In the investigative report, state patrol detectives reported they found evidence that Harper, 57, met with Tracy Wasserman during work hours, documented her preparing and using heroin, provided her with money to purchase heroin and failed to seize her cellphone during the execution of a search warrant. The state patrol completed its investigation in early January and forwarded the report to the Washington State Attorney General’s Office for consideration of charges.