I found this 2002 report on urine tests for pcp. Comments?

We recently observed three occurrences of false-positive results for phencyclidine (PCP) on urine samples tested with the Syva® RapidTest d.a.u.® 9 Test Panel (Syva Company, subsidiary of Dade Behring Inc.). The RapidTest d.a.u. 9 device is a single-use, one-step, solid-phase immunochromatographic ay for the qualitative, discrete detection of several drugs/drug metabolites in human urine (1). The urine samples were collected from three different patients who were seen in our Emergency Department within 3–4 weeks after we had implemented the RapidTest device in our laboratory (Danbury Hospital). Because PCP is not a commonly used drug in our locale and the rare positive results have usually been confirmed as false positives, three positive PCP results in such a short time period immediately suspicion.