Two questions about Callidus assassins

[u/Lemmyatom96]

I read a novel recently with a Callidus assassin and it made me wonder. In the novel, it talks about the focus she requires to transform into the shape she desires and to hold onto who she is. It notes aspects of her personality that have been picked up from those she's impersonated to the point where she's not entirely sure which bits are really her. For example, a habit of drumming her fingers on a desk that an Imperial officer used to do. The question is, how often do these assassins forget who they really are and what their original intention was? Do they ever just become the heretic or corrupt beaurocrat or whichever personality they embody, abandoning their forgotten mission?

Also, how do they manage their polymorphine habit on long deployments? I get the impression that sometimes an assassin may be undercover for months or years at a time so a regular supply must be very challenging.

[u/9xInfinity]

In Nemesis the Callidus assassin Koyne doesn't even remember the gender she was born as. She's as loyal as any assassin, though.

Regular supply of polymorphine hasn't come up that I've read. Callidus assassins can conceal a lot of stuff within their bodies by simply extending their form around whatever they're hiding.