And from the ACLU's amicus brief:
ARGUMENT The right to privacy inside one’s home “is sacrosanct.” The “‘right of a man to retreat into his own home and there be free from unreasonable governmental intrusion’ stands ‘at the very core’ of the Fourth Amendment.” Indeed, “unreasonable government intrusion into the home is “the chief evil against which the wording of the Fourth Amendment is directed.” Accordingly, it is a “‘basic principle of Fourth Amendment law’ that searches and seizures inside a home without a warrant are presumptively unreasonable.”
That school officials’ warrantless, non-consensual use of a camera, embedded in students’ laptops, inside the home is a search cannot be doubted. The use of “sense-enhancing technology” to obtain “information regarding the interior of the home that could not otherwise have been obtained without physical ‘intrusion into a constitutionally protected area,’” constitutes a search. Electronic video surveillance is sense-enhancing technology that triggers the Fourth Amendment’s warrant requirement. Courts have held that the requirements of Title III of the Omnibus Crime Control and Safe Streets Act of 1969 (“Title III”) support both the legitimacy of the expectation of non-surveillance within the home and supply the benchmark requirements for issuance of a video-surveillance warrant. Surreptitious video surveillance inside the home is far more intrusive and revealing than the infrared, thermal detection unit at issue in Kyllo. And, in fact, the “extraordinarily serious intrusions into personal privacy” caused by video surveillance has prompted some courts to require the government to justify such searches “by an extraordinary showing of need.” At least one Court has termed such surveillance “Orwellian.”
Importantly, school district officials cannot claim greater authority than can law-enforcement officers to engage in searches of students under the relaxed “reasonable suspicion” standard that typically applies to in-school searches under cases like New Jersey v. T.L.O. and Board of Education of Independent School District No. 92 of Pottawatomie Co. v. Earls.13 Those cases are predicated on the recognition that “the school setting requires some easing of the restrictions to which searches by public authorities are ordinarily subject.”14 Since the school district’s search in this case occurred outside of the “school setting,” the school search cases are inapplicable.
CONCLUSION In sum, plaintiffs are likely to prevail on their claim that the school district’s non-consensual, warrantless surveillance of young Mr. Robbins, inside the privacy of their home, violated the Fourth Amendment. In light of the potentially egregious invasion of privacy attending surreptitious video surveillance inside the home, and the irreparable harm caused thereby, the ACLU-PA wholeheartedly endorses the plaintiffs’ request for an immediate order enjoining the defendants, and others who may be acting in concert with them, from using any electronic surveillance on students outside of the school grounds unless they comply with Title III and the Fourth Amendment’s warrant requirement.
http://www.aclupa.org/downloads/Robbinsfinal.pdf