I wish these guys well.  I am concerned however that this type of application will stand up in court.  When providing video based evidence in court, CJIS and FIPS-140 compliance are mandatory in proving chain of custody.  It is doubtful that a $50 cell phone application over a commercial grade cell-phone network will meet those stringent standards.  Chain of custody (CoC), in legal contexts, refers to the secure chronological documentation, showing the time-stamps, custody, control, transfer, analysis, and disposition of the electronic evidence.  Public safety grade security and networking are requirement to meet that legal context.