I cannot answer your question, and the reason is the Canadian Charter of Rights and Freedoms.
According to the statistics, a good number of adults affected by depression have had symptoms, warning signs, or episodes before they are 18. Now, does that mean that everyone with symptoms of depression before they become adults will not be able to be a good soldier or a good police officer? We cannot make that assumption. It is very difficult to know whether those screening tools help us to identify people who may be susceptible to such problems.