Although the INTERPOL issued a Diffusion Notice against Karki soon after the Patan Appellate Court's verdict against him back in 2014, USA has refused it.
Since then, Nepal Police despite trying numerous times has failed to bring Karki back after the authorities in the USA refused to extradite him citing absence of extradition treaty between Nepal and the USA. The American authorities clarified that there was no legal base to hand over any citizen living in their territory legally.

Without American authorities permission, he cannot be arrested.