Actually the "standard" when I started policing in 1990 was "violation of any law where you could be imprisoned for more than a year".
This was the threshold for many states when it came to a law being classified as a "felony", and there was no crime of violence requirement.
However, this was very confusing because on the East Coast, in the original colonies that then became states..., there are some laws classified as a "misdemeanor" where a person could be imprisoned for more than a year (even today in Maryland we have some that go as high as 10 years ... but they are not felonies)..., AND there was also Common Law where the penalty was worded, "such sentence deemed fair and reasonable at by a judge"... vague... BUT that means a judge could lock up the convicted person for more than 365 days....so....,
THEN further problems because the standard was "could have" not "actually sentenced" so guys were filling out forms at the LGS and running into Federal violations because they had plead guilty to some law where the judge gave them Probation..., "well I wasn't sentenced to more than a year" ..., ah but could you have been ??? And poor dumb husbands who would be charged with domestic violence by their wife, or ex wife, and then plead guilty to "simple assault" which was a Common Law misdemeanor, and then the State Police would notify them to turn in or sell off their guns because of Federal Law.
Currently because of States' increasing of max penalties, the threshold is now, (iirc) 24 months. Felony or misdemeanor or common law, makes no difference.
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LD