Depending on how frequent or for how long, that would also be illegal. See <a href="http:&#x2F;&#x2F;www.dailytech.com&#x2F;Federal+Court+Cops+Cant+Spy+on+Your+Yard+and+Home+Without+Warrant&#x2F;article37002.htm" rel="nofollow">http:&#x2F;&#x2F;www.dailytech.com&#x2F;Federal+Court+Cops+Cant+Spy+on+Your...</a> 
Or the ruling itself: <a href="https:&#x2F;&#x2F;www.eff.org&#x2F;files&#x2F;2014&#x2F;12&#x2F;15&#x2F;vargas_order.pdf" rel="nofollow">https:&#x2F;&#x2F;www.eff.org&#x2F;files&#x2F;2014&#x2F;12&#x2F;15&#x2F;vargas_order.pdf</a><p>From the ruling:
&quot;The Court rules that the Constitution permits law enforcement officers to remotely and continuously view and record an individual’s front yard (and the activities and people thereon) through the use of a hidden video camera concealed off of the individual’s property but only upon obtaining a search warrant from a judge based on a showing of probable cause to believe criminal activity was occurring.  The American people have a reasonable expectation of privacy in the activities occurring in and around the front yard of their homes particularly where the home is located in a very rural, isolated setting.  This reasonable expectation of privacy prohibits the warrantless, continuous, and covert recording of Mr. Vargas’ front yard for six weeks.&quot;