Search cases that address your exact point of law using industry-leading collections of case law, with multiple layers of anti-hallucination features that help you verify cases and case analysis. Use deep dive tools to determine deep questions about an opinion and whether a case or a specific holding is still good law.
LOIS Legal Research
LOIS has access to a corpus of case law, which it can search, read, and analyze. You can search for case law in LOIS the same way you would make other requests, directly or as part of a larger request:
- ask LOIS to identify the holding, providing a breakdown of its reasoning
- ask LOIS directly to pull up a specific case
- while drafting a brief, ask LOIS to provide an argument for part of the case
Depending on the prompt, LOIS’ case references may look like a case name, a citation with listed sources, or even a “case lookup” box with one or multiple cases.
Regardless of the type of reference, any time LOIS includes a case or a case citation, you can click to view the referenced case and opinion in the Opinion Viewer.
Opinion Viewer
Click the case or citation to open the Opinion Viewer on the right side of the screen. The file displayed in the Opinion Viewer is the opinion itself, and it is not generated by AI.
Within an opinion, click a citation to navigate to that opinion, and so on. Use the arrows at the top of the viewer to navigate between pages of opinions.
Layers of Verification
LOIS’ anti-hallucination features embed trust directly into the process, allowing you to verify cases and citations quickly within the AI. Anti-hallucination features make it easier to verify:
- Is this opinion real?
- Does it mean what I say it means?
- Is it still good case law?
all from within LOIS.
Verify Cases
Whenever LOIS drafts any text—not only search results, but also an argument, a brief, an email, even a spell-fix—and recognizes something that looks like a case citation, it checks it against reporter databases and shows a colored indicator.
Cases that LOIS has confirmed show with a green checkmark icon. Click on these cases to open them in the Opinion Viewer.
If LOIS cannot confirm a case against its corpus, the case name is tagged as amber, with a caution icon. These cases may indicate a mis-formatted citation, a real case that's just not in the database, or a fabricated case.
Verify Citations and Reasoning
Every time LOIS pulls from case law, it cites and sources the information, with in-line citations and a list of sources at the end of the response.
Click the Sources list to open the list of sources. Click on each case in this list to open the Opinion Viewer for the case.
For every in-line citation, hover on the citation to view the case and the exact quotation the citation references. Click on the citation to open the Opinion Viewer for that case, with the exact quotation highlighted in a bounded box within the opinion.
These source verification tools allow you to audit source material and verify LOIS’ reasoning, right on the page. Quickly catch any cases that have been cited out of context.
Deep Dive Analysis
Use LOIS’ deeper dive analysis tools to ask follow up cases—use the opinion chat to ask about one specific opinion, or use Citate with LOIS to analyze how later courts have treated a specific holding.
Opinion Chat
Open a new chat with LOIS that’s narrowly-scoped and deep, focused solely on the opinion you’re dealing with. The opinion chat can be used for asking follow-up questions about one specific opinion—identify the disposition, provide the reasoning for the decision, answer whether there is a dissent—in a "child chat" that doesn't clutter the main research chat.
You can create an opinion chat from the Opinion Viewer. For any case, click the chat bubble icon in the top right of the Opinion Viewer, and then fill out your prompt.
Once you submit your prompt, the opinion chat opens in a new chat thread. It also appears in the chat history, just as any other chat. In an opinion chat, click Back to original chat at the top to navigate back to the “parent chat” thread.
Citate with LOIS
Use Citate with LOIS to determine whether a court opinion's holding is good law by analyzing how later courts have treated it.
Highlight any passage in an opinion and run an analysis to see whether that specific holding is still "good law." Surface cases that have treated, criticized, or quietly undermined that exact point, including implicit conflicts that traditional citators miss.
LOIS returns a list of cases that it has identified as relevant, including the level of relevance, the case name and information, and LOIS’ treatment.
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