In some countries, Supreme Courts write an opinion as a whole court. After all, the law is the law and there should be one unified interpretation of it, right? Well, that’s not how things operate in the Unites States. Court decisions recognize openly that the law is not always clear and certain. 

A justice can write a dissent to explain why they think the majority got it wrong or a concurrence, meaning they agree with the Court’s decision but not necessarily the steps to getting there. The lady justices discuss the process, which is also known as writing separately.