Clipped Ear - still sign of Trap, Spay/Neuter & Release, right?

My mom has started feeding a stray cat in her neighborhood. The cat appears to have had the tip of its left ear snipped off - - it looks professional not like an injury. She's skittish and won't let me get more than 3 - 4 feet from her so I cannot inspect too closely. She's in a fairly urban area so... show more My mom has started feeding a stray cat in her neighborhood. The cat appears to have had the tip of its left ear snipped off - - it looks professional not like an injury. She's skittish and won't let me get more than 3 - 4 feet from her so I cannot inspect too closely.
She's in a fairly urban area so its very possible there is a program in the vicinity.

Is a clipped ear still a sign of TNR programs?
Anyone have links to photos of TNR clipped ears so I can compare?
Is it customarily done to one or another ear or either?
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