4F-PVP
no false positive, none for a-PVP or MDPV for that matter. I know from personal experience. Drug tested twice a week a while back while using all three.
4-MPD
no false positive. Ill bet you all my internet credits,
5-APDB
some people have said they came up positive for AMP after 5-APB or 6-APB. I wouldn't risk it.