To try and explain this all...
First, we need to understand the fundemental difference between "samples" and "tests" or "test sessions" as the two are very different things
Fact 1: Lesnar provided 6 "Samples" over about a three week period
Now 5 of these samples came n his first week after signing the contract and my undstanding is this was over two "test sessions", so how does that work
Session 1
Urine sample - A single urine sample taken, this would be put through a general steroid screen, and in addition may be specifically tested for a number of things. Note, they do not test every single urine sample for every single thing, its simply not possible, there are thousands and thousands of things on the wada list, but it would have gone through a pretty thorough "menu" and the values would also have been added to a steroidal passport profile. So lets say, hpothetically this sample was analysed for a) basic steroidal analysis and b) specifically substances A to M
Blood Sample - for standard analysis - this would have been tested on a general level, hematocrit, reticulytes etc etc and also been used as the first entry in a blood passport profile
Blood Sample - for hgh analysis - this would be a dedicated blood sample for HGH analysis
Now see already we have 3 Samples which have been tested for a variety of things, is that in the strict sense of the word "3 tests".. well no, its 3 samples in a single "test session", which are then analysed for an awful lot of different substances and methods
Session 2
Urine Sample - as above, this would have been put through a general steroidal analysis, as well as testing for a selection of other things. This sample may or may not have been tested for the exact same things as in Session 1.. its unlikely. So lets say, hpothetically this sample was analysed for a) basic steroidal analysis and b) specifically substances N to R
Blood Sample - a second blood sample for general testing, as well as a second entry into the blood passport
Session 3
Single sample - The positive test date of 28/6 was single sample. It could have been either blood or urine, we dont know, and its very possible that this test was targeted based on prior tests.
But lets assume it was urine. In which case its only actually the THIRD urine sample collected, and its lets say hypothetically that this sample was analysed for a) basic steroidal analysis and b) specifically substances S to Z. If the substance detected was "Substance V" then this would be the first time his sample had been analysed for this particular substance.
By the strict letter, Brock didnt test positive on his "sixth test", he tested positive in "his third test session". It may well have been only his 3rd provided urine or blood sample.
And because they cant test every single urine sample for every single product known to man, its possible, that this was the first time his sample had been analysed for "substance x"