About: http://webisa.webdatacommons.org/210734721

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	So if you test positive on days 0-1-2 for heroin, days 2-3-4 you may test positive for morphine, not heroin.Then days 5+ you will in all likelihood pass the test, i.e. not test positive for either heroin or morphine.
http://www.w3.org/ns/prov#wasQuotedFrom	drugs-forum.com