No way of knowing for sure.
Nobody within our local governments seems to even care to find out whether they are in this country legally.
If we knew their immigrant status then we could check their background for criminal records. But around here (in Takoma Park and Montgomery County, MD), everybody wants to give 'em great big hugs, free education, free meals, rent assistance... they don't care if they may be criminals.
Totally understand. You know we have those folks here in Texas also.