Every document at SCOTUS level is freely available, although you have to know the docket number to get all of the briefs correctly. SCOTUSblog in practice is a

Every document at SCOTUS level is freely available, although you have to know the docket number to get all of the briefs correctly. SCOTUSblog in practice is a more accessible interface to the docket, since you can easily look up by case name: https://www.scotusblog.com/case-files/terms/ot2023/ https://www.scotusblog.com/case-files/terms/ot2023/, e.g., the full docket for the case in this article is here: https://www.scotusblog.com/case-files/cases/harrington-v-purdue-pharma-l-p/ https://www.scotusblog.com/case-files/cases/harrington-v-pur... If you want to deal with non-SCOTUS federal cases, your choices are to use PACER or to use RECAP (https://www.courtlistener.com/recap/ https://www.courtlistener.com/recap/), where the documents may be available. E.g., the appeals court docket for this case is at https://www.courtlistener.com/docket/67448481/in-re-purdue-pharma-lp/ https://www.courtlistener.com/docket/67448481/in-re-purdue-p..., note that many documents aren't available because no one made it free via RECAP. If you want to deal with state courts... good luck! Every state has a different system with different level of pains to track down.