Is it safe to freeze, thaw (in a fridge), refreeze and rethaw food? I've always heard you can't refreeze food one it's defrosted, but dad claims that's an old wives tale, stemming from when home freezer units came into vogue, and people had the misperception that freezing would kill the bacteria that made food spoil. So (claims dad) people thought that if a defrosted food was going bad, you could refreeze and thaw and it would return to the state it was in when you originally froze it.
Anyway, what say you, Chowhounds? OK to defrost and freeze again provide it's done within a reasonable amount of time?