https://en.wikipedia.org/wiki/Kyllo_v._United_States https://en.wikipedia.org/wiki/Kyllo_v._United_States (IANAL) The majority opinion in Kyllo seems to have e

https://en.wikipedia.org/wiki/Kyllo_v._United_States https://en.wikipedia.org/wiki/Kyllo_v._United_States (IANAL) The majority opinion in Kyllo seems to have established that external surveillance featuring commercial, off-the-shelf devices did not require a warrant. Anything which features non-commercially available technology does. Notably, Scalia dissented in his majority as arguing that even commercial availability (which changes as future tech popularizes) was a dangerous precedent to set and the line should be further in favor of home privacy. The dissent argued that the external nature of the surveillance made a warrant unnecessary.