The Justice Department is already requiring warrants for federal agents using stingrays. That decision didn&#x27;t affect local&#x2F;state departments, but AFAICT everything in California is covered under one or the other now.<p><a href="https:&#x2F;&#x2F;www.washingtonpost.com&#x2F;world&#x2F;national-security&#x2F;justice-department-agencies-will-have-to-obtain-warrant-before-using-cellphone-surveillance-technology&#x2F;2015&#x2F;09&#x2F;03&#x2F;08e44b70-5255-11e5-933e-7d06c647a395_story.html" rel="nofollow">https:&#x2F;&#x2F;www.washingtonpost.com&#x2F;world&#x2F;national-security&#x2F;justi...</a>