I : I might wonder about possible operator error. The pregnancy tests must be done exactly as directed on the box. For instance, if you read if after the designated time, then it can read as positive even though it isn't. Another issue, if read after a time delay is that there can be a faint gray line that is from where urine dries, but a person might read it as positive. These are the only answers that i can think of.
Answered 4/2/2020
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