Detective Smith submits an application for a search warrant, listing items he expects to find at 77 Sunset Strip that are being used to further narcotics trafficking. The accompanying affidavit says:
For the purpose of showing probable cause that a crime has been or is being committed and that the above described items exist and are located at the above described place, Affiant states the following facts which he has reasonable grounds to believe and does believe to be true:
(1) Your Affiant is a police detective employed by the county of Exampledonia, with fourteen years experience in the field of narcotics investigation.
(2) Richard Roe, of 77 Sunset Strip, provided your Affiant with photographs which he stated were taken by his cellphone camera in the basement of 77 Sunset Strip on [a date two days ago].
(3) These photographs appear to show plastic baggies, a large quantity of white powder, and a digital scale.
(4) Roe says that he rents his basement to a tenant, John Q Doe.
(5) Based on your Affiant’s knowledge, training, and experience, the presence of plastic baggies, a large quantity of white powder, and a digital scale are indications of the use and sale of controlled substances.
(6) Your Affiant was also approached independently by Sally Boe, who related that she entered the fenced back yard of 77 Sunset Strip, opened the unlocked the basement door, and observed a stack of plastic bags tightly packed with white powder and three semiautomatic pistols on a table in view of the basement door.
(7) Based on your Affiant’s knowledge, training, and experience, the presence of plastic bags tightly packed with white powder and multiple firearms is a strong indication of the sale of controlled substances.
No argument, I assume, that this is legally sufficient to support probable cause for a search warrant?
Now let’s imagine the warrant is executed, and in fact a large quantity of controlled substances and firearms are seized – and then that we later learn that Sally Boe is the vengeful ex-wife of John Q Doe, the basement tenant – and that Detective Smith knew this, but did not mention the fact in the warrant affidavit.