New study: AI content isn't moving law firm Google rankings
Custom Legal Marketing (CLM) analyzed the top 5 organic Google results for 28 legal keywords across 24 major U.S. cities in February 2026. The question was simple: does AI-written content help or hurt rankings?
Short answer: neither. Across 2,435 ranking appearances (1,618 URLs, 1,021 domains), AI percentage on a page showed no statistically significant connection to position. The Spearman correlation was r = 0.065 with a p-value of 0.138.
What the data actually shows
- AI is everywhere-but split into extremes. 54.7% of ranking pages had 5% or less AI-detected content. 21.4% were 70%+ AI. Fewer than 25% sat in the 6-69% "middle."
- Practice areas diverge. Personal injury pages showed the most AI by far (median 14% vs. 3% across all practice areas). Not a single PI page in the top 5 was "clean." In criminal defense, 87% of Position 1 pages had under 10% AI-making it the most human-written set.
- Blended beats pure AI. Pages with 26-50% AI (likely AI-assisted then heavily edited) had the best average rank (2.83) and the highest average word count (2,958). Pages at 71-100% AI were shorter (1,561 words) and ranked worse on average (3.23).
- Readability suffers as AI rises. AI percentage correlated negatively with readability (r = -0.233, p < 0.0001). Translation: more AI, harder to read. Word count had a small but significant tie to better rankings (r = -0.089, p = 0.042).
- Local markets vary. Columbus, OH was the outlier with 59% mean AI and a 76% median, likely due to national-firm dominance. San Antonio (16.9%), Jacksonville (18.3%), and Houston (19.3%) were lowest, where local/regional firms lean on traditionally written pages.
Method snapshot
CLM used its Sequoia Research Tool to run 672 mobile queries (matching Google's mobile-first indexing), scraped results with a headless browser, and scored each page with Winston AI for percent AI content. In total, 1,889,828 words were processed; 615,934 (32.6%) flagged as AI-generated.
The study covered 24 metros, including New York, Los Angeles, Chicago, Houston, Phoenix, Philadelphia, San Antonio, San Diego, Dallas, San Jose, Austin, Jacksonville, Fort Worth, Columbus, Charlotte, San Francisco, Indianapolis, Seattle, Denver, Boston, Nashville, El Paso, Detroit, and Oklahoma City.
Full details live here: CLM's study on AI content in law firm rankings.
Don't misread the PI outlier
18.2% of Position 1 results for PI keywords came from pages with 70%+ AI content. Those wins clustered with firms that already have massive authority. The lift is almost certainly the domain, not the copy.
What to do next if you run a law firm or legal marketing team
- Prioritize authority and links. Rankings still follow domain strength and high-quality mentions. Invest in digital PR, authoritative citations, and "real world" signals.
- Adopt a blended workflow. Use AI for outlines, research, or first drafts-but edit hard. The 26-50% AI range performed best and produced the most comprehensive pages.
- Fix readability before publishing. Short paragraphs, clear headings, plain language, and tighter sentences. More AI without editing correlates with harder-to-read pages.
- Write something worth indexing. Add jurisdictional nuance, examples, FAQs from intake calls, and next-step guidance. Thin summaries won't move you from Position 5 to 1.
- Match search intent by practice area. PI buyers want reassurance, process clarity, and proof of results; criminal defense skews to human, trust-heavy copy. Calibrate tone and depth accordingly.
- Double down on local SEO. Accurate NAP, practice-area pages by city, structured data, local reviews, and practice-specific service areas. These still compound.
- Measure what matters. Track scroll depth, time on page, CTA clicks, calls, and cases opened. If readability drops, conversions usually drop with it.
- Optimize for mobile first. Test speed, Core Web Vitals, and tap targets. Google indexes mobile; your prospects read there too.
- Guard E-E-A-T signals. Attorney bios with credentials, case experience, citations, and clear authorship/editing trails help trust. See Google's guidance on helpful, people-first content.
Working benchmarks (use, don't worship)
- Aim for a blended approach where humans heavily revise AI-assisted drafts.
- Depth tends to win: long-form pages often correlate with better positions-so long as they're readable and focused.
- If AI use climbs, intensify editing for clarity and scannability to offset the readability drop.
Bottom line
AI content isn't a cheat code or a penalty trigger for law firm SEO. Authority, useful content, readable pages, E-E-A-T, and local signals still decide who shows up first. Spend accordingly.
Further reading and training
- CLM's full study
- AI for Legal - practical resources for attorneys and legal marketers using AI responsibly
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