As far as issues go, try to think of who would be using the app and what benefit over existing methods it would provide.
If your target is a police force for instance, many of them do not have the resources to allow forensic analysts to gather data at the scene, only police officers. This would change the layout and language of your application as it would have to be tailored to suit a less technologically knowledgeable person/people.
Also the person using your application would need an untouched, dedicated business phone that the application could be used on. If not, (as if the case with many police forces) then the practically of such an application is seriously questioned.
If they do have such a device, how will your application save the police force time/money over using conventional methods (i.e. Camera, seizure forms and police notes). If you can't prove it would save time then practically it would never get used. This is before you even consider the legal issues.
They are many other issues dependant on what your user audience is. I would recommend trying to get in touch with those who you intend to be your user and gather some client requirements, researching how they do things currently.
I hope this is of help.
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