?   = Data Point is QUESTIONABLE in its reporting
I   = Data Point is INCONSISTENTLY reported across displayed bureaus, an infraction of the 5th point of Metro 2 Five points of compliance!
M   = Data Point is MISSING and or is DEFICIENTLY reported as compared to what is most likely information that SHOULD OF BEEN adequately reported!
U   = Data Point is else wise UNPROVEN , as reported! Undocumented claims can NOT be assumed valid nor compliantly reported!