Your sister tested positive for amphetamines in her urine could this mean that she is using crystal methamphetamine or would that show up as positive for methamphetamine?

Answer 1

She would most likely test positive for methamphetamine and amphetamine. One of the breakdown products of methamphetamine is regular amphetamine, so a positive result for methamphetamine is basically needed to discriminate a positive amphetamine as due to ingestion of meth vs ingestion of amphetamine. So basically, your sister's test should be positive for methamphetamine also if she did crystal meth.