Urine Toxicology
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Mercy's won't detect Klonopin

DRUG DETECTION TIME IN URINE FOLLOWING LAST DOSE 
The duration of excretion of detectable amounts of drug in the urine following 
last intake is highly variable. A general rule of thumb is five plasma half-
lives. This is simply a rough estimate given the following variables: route of 
administration, amount of drug taken, frequency of use, individual metabolism, 
urinary pH, and drug storage within body. 

The usual drug screen includes the tests below 

DRUG                    ACUTE USE       CHRONIC USE   
Amphetamines            one day         several weeks 
Barbiturates 
 short acting (e.g. Seco):              one day
 long acting (e.g. Pheno):              2-3 weeks 
Benzodiazapenes         3 days          4-6 weeks 
Cocaine Metabolites     2-3 days        several days 
Codeine/Morphine        2-4 days        several days 
Methadone               2-3 days        i-2 weeks 
PGP                     up to 1 week    1-2 weeks 
Propoxyphene            1-2 days        several days 
Marijuana 
 single smoke:          up to 4 days 
 moderate use:          up to 10 days 
 heavy use              up to 4-6 weeks 
 passive inhalation:    negative 
Nicotine moderate use:  1-2 days

SOURCE: Quest Diagnostics, Cambridge, Massachusetts