Does Marshalls sell knockoffs?

Excuse me, could you please clarify something for me? I've heard some rumors that Marshalls, the popular discount retailer, might be selling knockoff products. Is this true? I'm really interested in knowing if their merchandise is all authentic and if there's any risk of purchasing counterfeit items from them. It would be great if you could provide some insight into their sourcing practices and any measures they take to ensure that the products they sell are genuine. Thank you in advance for your help!