Shmuel K. asked:
The Gemarah brings a Baraisa that a Cohen who does Kabollah with his left hand is Pasul. The Gemarah more clearly in Bechorot 45B states that a Left handed Cohen ( a Lefty ) is Pasul for Avodah. The question is why Lefty Cohanim are allowed to Duchin ? since this represents Avodah, they should be Pasul ? Are we to answer , as per O.C. 128:38 MB 139 , that since there is only an Isur, we are more Mekul for Duchining ?
The Kollel replies:
With regard to performing the Avodah, left-handed is considered a Mum. A Ba'al Mum, though, is permitted to perform Birkas Kohanim.
D. Zupnik