I hate when people talking about something they have never tried. I have been using this kit for a long time.
take a look here all is documented
http://www.dfs.virginia.gov/wp-content/uploads/2013/08/Approved-List-of-Field-Test-Kits-12-3-12.pdf
on the bottom you will see mentioned ampules B, the right column
it is approved by government labs.
This test has been around for a long time and you look like you have been around for a long time and you claim to have no knowledge of this test.
How do you test your gear just pin and hope for the best ?
it is approved by state, government labs to be used by customs, LE, police etc.
I do not know why do I have to have each time fight with somebody who has no clue what he is talking about.