How can Cobb use Mal's totem for a reality check?

Isn't this defeating the whole idea of totems.

That totem belongs to Mal so how can Cobb use that to check for reality. Wouldn't that give inaccurate result??

  • 2
    Possible duplicates here and here. – Walt Oct 21 '17 at 11:47
  • Agree on the duplicate point, particularly the second one. – Steve-O Oct 21 '17 at 15:05

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