No. By using Australian Standards approved drug testing devices the likelihood of a false positive is drastically reduced. But there are occasions when a false positive can occur from a donor who is neither abusing drugs nor has taken an illicit drug. This is why it is recommended that all positive tests should be confirmed by a National Association of Testing Authorities, Australia (NATA) Accredited Laboratory for further testing. All on-site tests should be considered presumptive until verified by an Accredited Laboratory.