Why is Snape allowed to continue spying?

[greatelderone]

No: HPFGUIDX 131616

--- In HPforGrownups at yahoogroups.com, "Hagrid" <aussie_lol at y...>
wrote:
> (after being away from DE and Snape so long, LV didn't know who he 
> could trust. Since LV didn't reveal his plans, Snape could have
been 
> excused for not helping then)

GEO: But Voldemort had Crouch under the Imperius curse for more a few 
months and would have had the time and leisure to interrogate the 
former head of the department of magical law enforcement on what 
happened after his fall and which Death Eaters snitched and which 
remained loyal and given his position he would have certainly been an 
expert on the matter considering he presided during the wizengamot 
trial in which Karkaroff snitched on Rookwood and would have probably 
known about Snape being a spy so that the latter could have avoided 
Azkaban.