Problem solved.
For anyone that runs into this problem here is what I found.
Since /arrests/ has other data holder templates you can't pass the name of any of the children or you will get a 404 since those templates don't have a page.
Work around is call, as in my example, instead of /arrests/february-2016/, since february-2016 is only a template without a page this generates an error.
Instead, enable url segments on /arrests/, then call /arrests/s/february-2016/
Since there is no possibility of their being a data template named "s", it will load without a name collision.
You can replace "s" with anything, as long as you know that none of your data templates will have that same name.
John W.'s post in URL Segments passing callback paramaters -- Help? was marked as the answer