Book 3
Time turner.. (well its not about how it works..we know the loop hole there.)
Harry and Hermoine go back in time n save Sirius and cm bck in hospital wing w/o actu leaving the place..
Wen Snape comes Striding in hospital wing and asks Harry how he helped Sirius escape..
Dumbly says they didn't leave hospital wing,how cud they save Sirrius unless they can be at two places at one time... he directly gave away that they used TT.. didn't he?
I mean obviously Snape n Fudge knew TT exists..
And Didnt hermoine tell that McGonagall had to write all sorts of letters to the Ministry of Magic so she could have one.
And r u telling me MINISTER OF MAGIC didnt know that HERMOINE had a TT or he believd she was just using it for lessons.. but even if thought so..was he dumb enough to ignore Dumbly's line..
And Snape was smart enough and he literaly 'knew' it was harry who helpd Sirius escape so it shudnt hv been tht diffclt to guess..