i had to take a test after a injury at work and the test came back postive
( unconfirmed) for thc with negaive units listed in ref range, whats this mean?

also in the past i had to take a drug test monthly for 5 years so im familar with the process and chain of command, my issue here is after they took sample in bottle they didnt seal it and have me intial bottle or anything, on the test result sheet i got from the lab it says chain of custody--no