NEW : 420 patients are tested for hepatitis B , hepatitis C and HIV , health department says . `` He seems highly competent to me , just a smart guy , '' said Frank Dale , one of Harrington 's neighbors . Scores of Dr Scott Harrington 's patients undergo testing at a Tulsa government building . 7,000 patients of his patients were warned that they may have been exposed . An investigation found unsanitary conditions and ` ` cross - contamination '' issues .
NEW : 420 patients are tested for hepatitis B , hepatitis C and HIV , health department says . Scores of Dr Scott Harrington 's patients undergo testing at a Tulsa government building . 7,000 patients of his patients were warned that they may have been exposed . An investigation found unsanitary conditions and ` ` cross - contamination '' issues .