Apparently according to an outlet I've never heard of, the UK police are getting period tracker data on people with pregnancy losses. https://www.tortoisemedia.com/2023/10/30/british-police-testing-women-for-abortion-drugs/

...I did really not need to do period tracker discourse again. The question remains: what is this data useful to prove? Unless how long the people were pregnant was otherwise unknown, I genuinely don't understand what period tracker data adds.

(The drug testing is actually legitimately a big deal.)