Critical Thinking: A Local Police Department Suspects That Three Individuals, Alvin, Simon

Critical Thinking:
A local police department suspects that three individuals, Alvin, Simon, and Theodore, are growing marijuana on their property and selling it around town. The officers, though, do not have probable cause to obtain a warrant. As a result, the officers begin discussing some creative avenues for acquiring information about these individuals and their activities. A rookie officer who majored in Political Science in college offers three options: 1) looking through trash left outside of the suspects' home; 2) flying over the suspects' backyard and using standard binoculars to search for marijuana plants; and 3) using a newly developed piece of equipment that can scan the suspects' house and detect the presence of large quantities of organic plants. Answer the following questions about these options.
-An officer's act of visually inspecting the inside of the car at a DUI checkpoint is:

A) a violation of the Fourth Amendment, according to Supreme Court precedent
B) a violation of the 2nd Amendment, according to Supreme Court precedent
C) not a unconstitutional, according to Supreme Court precedent
D) only acceptable with a warrant, according to Supreme Court precedent