"Guillermo" wrote in
oups.com:

The safety pilot is not necessarily the PIC. This has to be agreed
between the two pilots. If the safety pilot chooses to be PIC, then he
gets to log time. If he doesn't act as PIC, he doesn't log time.
Furthermore, there could be cases in which the safety pilot cannot act
as PIC, such as being safety pilot in a complex aircraft without being
complex endorsed. Nothing prevents that pilot to be safety pilot, and
long as he has a private certificate in the same category and class
(i.e. ASEL). But he can't act as PIC, therefore, he doesn't get to log
any time. Same if he is not current or he hasn't had a biennial. He
does need a medical certificate because he is a required crewember.

But the point is that someone is still PIC, and that PIC needs to be
current...