If you read the instructions it wants you to test 72 hours before and again right before you need to have the test.
I have them just in case anyone wants to be an asshole. I had to test before my step brother's wedding- only used one and didn't bother doing the kids.
Took a pic of the same test in 3 different positions to "prove" we were all negative
ALERT: THIS IS DAMN GOOD!
I do not make recommendations like this, normally. Please take a look.
FEMA Region I
Lead Support Engineer and CompTIA CertMaster Subject Matter Expert
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