If an individual has used bennies or meth, the drug be detected in the urine for 48-72 hours. Methamphetamine can be detected for between 48-96 hours after use.
The exact length of time that uppers can be detected is not an exact science. The exact length of time the drug can be detected using a standard test will depend on a number of factors, including:
Age
Amount of drug used
Body size
Fluid intake
Gender
Length of usage
Metabolism
Method of ingestion
Percentage of body fat
Tolerance
Weight
Amphetamine users should keep in mind that simply because they have passed a drug test, it doesn't mean that the drug has left their system entirely. It only means that there wasn't a high enough level in his or her body to trigger a positive reading.