I responded to this in an earlier thread. If there is a question asked of the applicant such as 'any other health conditions' and the applicant does not disclose ITP, they will not be hired if the condition is discovered because they were dishonest on the application. That's a bad reason not to be hired, and if he later goes into remission the earlier dishonesty could still be held against him.
If during the physical bruises are noticed the doctor might ask the applicant for more information.
Practically speaking, very low counts could put a police officer at significant risk on the job so it makes sense that it could be a condition of concern during hiring.
Also, medical testing for hiring will vary. It is possible that blood could be drawn and tested.
I used to be responsible for all testing related to hiring at a large county system that included sheriff's deputies.
Erica
And she was!
Diagnosed May 2005, lowest count 8K.
4/22/08: 43K (2nd Rituxan)
10/01/09: 246K, 1/8/10: 111K, 5/21/10: 233K
Latest count: 7/27/2015: 194K
