These questions and answers provide you with an introduction to Massachusetts product liability laws, but there is no substitute for proper legal advice. The law automatically holds manufacturers, wholesalers, and retailers responsible if their product is found defective.A design defect is a flaw in the original design of a product that makes it inherently dangerous or unsafe, even when it is manufactured and used as intended. If an item is defective, the warranty promises that you will receive repairs, a replacement, or a refund. In a design defect case, the product is put together correctly. A design defect product liability lawsuit arises when there is a flaw in the product design that makes it inherently dangerous or defective. What Should You Do After a Defective Product Injury? Contact us today to find out if you have a case. What Constitutes a Defective Drug Claim in Massachusetts? Under Massachusetts law, there are various ways in which a product may be defective.