321
RESULTS : Fourteen of 248 ( 5 . 6 % , 95 % CI 2 . 7 % - 8 . 5 % ) plasma samples were positive by immunoassay testing for benzoylecgonine and no samples ( 0 % , 95 % CI 0 - 1 . 2 % ) were positive for amphetamine .
 Chemical: benzoylecgonine; Chemical: amphetamine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: benzoylecgonine; Chemical: amphetamine