i can't answer that question. i am not sure what drug that came up positive the type of test you had (blood urine hair) how high those levels were or your honest (and i mean honest) drug history. while drug tests have been known to come up false-negative it is really up to you to explain to your new company what may have occurred. certain drugs can stay in your system for quite a while.
my drug test for a new company position came up looking like i bought some yhing from the head shop. and i did not why