Not sure what kind of samples you plan to bring but my experience bringing consumer goods through both airports was nothing but a breeze on my last voyage. On that trip there were 4 or 5 of us with 3+ bags a piece [large event, large products] and aside from reviewing the form to see what we were doing with all that gear, we walked right through without so much as a bag opening.
Of course nothing that I brought was medical, food, liquid or in any way hazardous so really aside from worries about resale there wasn't any reason to stop us.