my son is on probation and went to urgent care on Saturday for a sore throat he s had since april. son was diagnosed with severe step throat and heart murmur due to the case of the infection. son had to do a alcohol and drug drop on Monday, results came back negative but servellance office didn t tell him what they found in the results. he s currently taking amoxicillin and spraying his throat with chloraseptic spray. he s doing so well on probation that now being sick can cause him violation and jail time. Do any of these medication cause false readings?