If you stop for 2 week with out cocaine will you pass hair drug test?

Short answer: NO!

While traces of cocaine in blood, urine, or saliva test can remain detectable from anywhere between a few hours and a few days after cocaine use, its metabolites (including benzoylecgonine) can remain traceable for several weeks (even months), and these are often tested for. It should also be noted that hair testing has grown in popularity with many organisations as hair retains traces of virtually everything you ever ingest or imbibe. Hair testing can identify the substance as well as approximate time line and dosage consumed; it can even be used to analyse your diet!