{"id":15556,"date":"2025-11-16T14:33:17","date_gmt":"2025-11-16T19:33:17","guid":{"rendered":"https:\/\/www.carolinaattorneys.com\/blog\/?p=15556"},"modified":"2025-11-16T14:33:17","modified_gmt":"2025-11-16T19:33:17","slug":"breath-blood-bull-challenging-nc-dwi-sfsts","status":"publish","type":"post","link":"https:\/\/www.carolinaattorneys.com\/blog\/breath-blood-bull-challenging-nc-dwi-sfsts\/","title":{"rendered":"Breath, Blood, Bull: Challenging NC DWI SFSTs"},"content":{"rendered":"<p data-start=\"212\" data-end=\"650\">This post continues the <em data-start=\"688\" data-end=\"713\">Breath, Blood, and Bull<\/em> series, an in-depth look at how science, procedure, and perception collide in the <img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-15923 lazyload\" src=\"\/jshared\/img\/icons\/spinner.svg\" data-src=\"https:\/\/www.carolinaattorneys.com\/blog\/wp-content\/uploads\/2025\/11\/Challenging-NC-DWI-SFSTs-300x168.webp\" alt=\"North Carolina standardized field sobriety tests illustration with police officer patrol car law books and scales of justice for DWI rights education\" width=\"300\" height=\"168\" data-srcset=\"https:\/\/www.carolinaattorneys.com\/blog\/wp-content\/uploads\/2025\/11\/Challenging-NC-DWI-SFSTs-300x168.webp 300w, https:\/\/www.carolinaattorneys.com\/blog\/wp-content\/uploads\/2025\/11\/Challenging-NC-DWI-SFSTs-1024x574.webp 1024w, https:\/\/www.carolinaattorneys.com\/blog\/wp-content\/uploads\/2025\/11\/Challenging-NC-DWI-SFSTs-768x431.webp 768w, https:\/\/www.carolinaattorneys.com\/blog\/wp-content\/uploads\/2025\/11\/Challenging-NC-DWI-SFSTs-1000x561.webp 1000w, https:\/\/www.carolinaattorneys.com\/blog\/wp-content\/uploads\/2025\/11\/Challenging-NC-DWI-SFSTs-214x120.webp 214w, https:\/\/www.carolinaattorneys.com\/blog\/wp-content\/uploads\/2025\/11\/Challenging-NC-DWI-SFSTs.webp 1312w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/> prosecution and defense of DWI cases in North Carolina. The first installment examined the limits of chemical testing. The second article turned to the machines that interpret alcohol breath samples into evidence, using the \u201cbreathalyzer.&#8221; This post focuses on the field sobriety tests or &#8220;SFSTs&#8221; that often precede BAC testing.<\/p>\n<p data-start=\"212\" data-end=\"650\">Standardized Field Sobriety Tests (SFSTs) are a battery of three roadside exercises: Horizontal Gaze Nystagmus (HGN), Walk-and-Turn (WAT), and One-Leg Stand (OLS), designed by NHTSA to gauge impairment.<\/p>\n<p data-start=\"989\" data-end=\"1226\">When prosecutors rely on Standardized Field Sobriety Tests to support a DWI charge, the assumption is that these dexterity exercises offer reliable, objective proof of impairment. Yet the science tells a more complicated story.<\/p>\n<div class=\"read_more_link\"><a href=\"https:\/\/www.carolinaattorneys.com\/blog\/breath-blood-bull-challenging-nc-dwi-sfsts\/\"  title=\"Continue Reading Breath, Blood, Bull: Challenging NC DWI SFSTs\" class=\"more-link\">Continue reading<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>This post continues the Breath, Blood, and Bull series, an in-depth look at how science, procedure, and perception collide in the prosecution and defense of DWI cases in North Carolina. The first installment examined the limits of chemical testing. The second article turned to the machines that interpret alcohol breath samples into evidence, using the [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":15924,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[90,6],"tags":[1433,98,2523,2518,2535,1142,2525,2519,2529,319,1447,2524,2522,2092,2532,1275,2526,2049,2521,332,2528,2530,402,2533,2531,2520,2517,1340,2534,2527],"class_list":["post-15556","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dui","category-dwi","tag-bac-testing","tag-bill-powers-dwi-lawyer","tag-breath-blood-and-bull","tag-challenging-sfsts","tag-charlotte-drunk-driving-lawyers","tag-charlotte-lawyers","tag-cross-examination","tag-dui-defense-nc","tag-dwi-attorney-charlotte","tag-dwi-defense","tag-dwi-defense-lawyer","tag-dwi-evidence","tag-dwi-law","tag-dwi-trial-strategy","tag-expert-witness-dwi","tag-field-sobriety-tests","tag-hgn-test","tag-iredell-dwi-lawyers","tag-nhtsa-protocol","tag-north-carolina-dwi","tag-one-leg-stand-test","tag-police-errors-sfst","tag-reasonable-doubt","tag-roadside-testing","tag-scientific-validity","tag-sfst-accuracy","tag-sfst-limitations","tag-standardized-field-sobriety-tests","tag-union-county-nc-dui-defense-lawyers","tag-walk-and-turn-test"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Breath, Blood, Bull: Challenging NC DWI SFSTs &#8212; Carolina Criminal Defense &amp; DUI Lawyer Updates<\/title>\n<meta name=\"description\" content=\"What you need to know about SFSTs - Standardized Field Sobriety Tests in North Carolina, DUI charges and defenses - Bill Powers DUI Lawyer\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.carolinaattorneys.com\/blog\/breath-blood-bull-challenging-nc-dwi-sfsts\/\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Breath, Blood, Bull: Challenging NC DWI SFSTs &#8212; Carolina Criminal Defense &amp; DUI Lawyer Updates\" \/>\n<meta name=\"twitter:description\" content=\"What you need to know about SFSTs - Standardized Field Sobriety Tests in North Carolina, DUI charges and defenses - Bill Powers DUI Lawyer\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/www.carolinaattorneys.com\/blog\/wp-content\/uploads\/2025\/11\/DRUNK-DRIVING-SOBRIETY-TESTS-SFSTS-IN-NORTH-CAROLINA.webp\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Carolina Attorneys\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"13 minutes\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Breath, Blood, Bull: Challenging NC DWI SFSTs &#8212; 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