Preimplantation genetic diagnosis generates a series of ethical and legal questions: Which goals does it pursue? Does it protect the embryo? Should this technique be regulated by the legal system? And if so, which is the incumbent criteria? This research describes the limits that some international laws regulating this technique have considered. Additionally, a series of judgments about the legal problems that have occurred with the application of this technique will be analyzed, among them, the misdiagnosis.