Spoilers ahead!!
Some may think that the case against vikram can be opened by using the drug overdose and call records of her wife but here lies the irony. The director smartly in one scene says that in India a person does a crime and then he becomes a NRI.
Vikram lives in UK and the director very smartly makes a reference of Lalit Modi and Vijay Mallaya. So even if Dev has evidence against Vikram he can do nothing.
Hats off!!
I think i could explain my point to everyone.