Attention geniuses and mathemagicians,

I need your help with some probability issues. Our school (my kids attend and I coach for) has a "random" drug screening policy for student athletes. For each testing period, 10 names are selected from a pool of approximately 175. Tests may be conducted monthly during the school year, so, perhaps 8 or 9 times per year.

I have heard testimony from at least 3 other parents that their children have been "randomly" tested MULTIPLE times (as many as 4-5) during the same school year. The testing administrator even admitted that this has occurred with some frequency.

He directed me to a website of the randomizer they use. The domain he gave me is for sale, as is the same domain name with a couple other common extensions I tried.

I realize that the above scenario is not impossible, but I also know that it is HIGHLY unlikely. When I asked the administrator "at what point do you question the integrity of your randomizer?" He had no reply.

So please, help me out here. At what point do you say, something fishy is going on? Please do supply any relevant statistical data you can come up with. It has been far too long since I sat through Statistics, so I could really use and would greatly appreciate your input!

## Comments rated to be Good Answers:

Re: Probability Help" by Rixter on 05/29/2021 10:30 AM (score 3)## Comments rated to be "almost" Good Answers:

Re: Probability Help" by Rixter on 05/26/2021 3:19 PM (score 1)Re: Probability Help" by Randall on 05/27/2021 9:32 AM (score 1)Re: Probability Help" by Rixter on 05/27/2021 10:06 AM (score 1)Re: Probability Help" by phoenix911 on 05/27/2021 11:21 AM (score 1)