New Mexico's breast density reporting bill was vetoed by Gov. Susana Martinez and thus will not become law just yet.
The bill, HB 243, received unanimous support in both the house and senate, but Martinez did not take action on it before the April 7 deadline, resulting in a pocket veto.
However, Rep. Elizabeth "Liz" Thomson (D-Bernalillo) said she will "definitely bring the bill before the legislature until it becomes law in New Mexico."
This is the second time a density reporting bill was vetoed, according to the Are You Dense Advocacy group. In 2011, Gov. Jerry Brown of California vetoed a density reporting bill. The following year, with the leadership of Sen. Joe Simitian, California became the fifth state to enact a density reporting law on September 22, 2012.
Currently there are 29 state density reporting bills, as Colorado's bill was signed into law on April 6. Iowa and Kentucky are awaiting governors' action.











![A normal mammogram confirmed by three-year radiologic follow-up illustrates reader-marked regions of interest (ROIs) during (A) unaided (round 1) and (B) artificial intelligence (AI)–assisted (round 2) reading. Each colored dot represents an ROI for recall by a human reader. Readers could mark more than one ROI per case, represented by multiple dots of the same color. During AI-assisted reading, the AI system displayed three visible prompts: two with suspicion of malignancy scores of 35% (left mediolateral oblique [L MLO] and craniocaudal [L CC]) and one with a suspicion of malignancy score of 10% (right craniocaudal [R CC]), shown as polygonal overlays. Without AI, six of 10 readers (60%) marked a false-positive ROI. With AI assistance, this fell to two of 10 (20%). R MLO = right mediolateral oblique.](https://img.auntminnie.com/mindful/smg/workspaces/default/uploads/2026/07/2026-07-14-radiology-mammogram-ai-auto-bias.H0bYO8QlWs.jpg?auto=format%2Ccompress&fit=crop&h=112&q=70&w=112)






