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I am having a bit of an argument with my DM.
The rules say that you can have sneak attack if "you don’t have disadvantage on the attack roll".
If I have both advantage and disadvantage, that results in a straight roll when attacking. A straight roll suggests that sneak attack is allowed.
My DM interprets it as, if I have a source of disadvantage, regardless of weather I also have advantage or not, the fact I am being disadvantaged in some way prevents sneak attack from triggering.
Can someone please let me know who has the correct interpretation?