Are there any labs that will test breastmilk for silicone leakage after torn cohesive gel implants?

Hello, I am not aware of routinely available tests for silicone in breast milk.  Previous scientific studies tested for silica, an element found in silicone, and did not find elevated levels of silica in breast milk of patients with implants.

should help you find a lab that can do this for you.  The question I have is why are you so concerned about this?  Truly cohesive implants should not allow particulates to migrate into your breast tissue as did the old generation implants.  And with those older implants, silicone is inert and non-reactive so it shouldn't be harmful except for the local reactions they created such as granulomas.