They say that a prosecutor can get a grand jury to indict a ham sandwich. That's close to true.
The same is true when cops want a judge to sign a search warrant. They can pretty much always find someone who'll sign off on even the most vacuous claims of probable cause.
A True Story
Police in Hardin, Texas got a tip. Reports on just what the tip was conflict. Dozens of dismembered bodies buried at a farmhouse? Children in danger at that farmhouse? Either way, they got a warrant.
Because when Jesus and 32 angels tell Angel about what's going on at the farmhouse. The Times reports.
Equipped with a search warrant and cadaver-sniffing dogs, deputies from the Liberty County Sheriff’s Office converged on a home on a narrow country road near Hardin — about an hour outside Houston — in search of a macabre crime scene. The news of a mass grave in rural Texas set off a news media frenzy: throngs of reporters camped outside the home, two news helicopters circled above, and cable news stations flashed alerts that up to 30 bodies had been found.
Liberty County Sheriff's deputies, the FBI, DPS officers and the media converged on the town of Hardin looking for signs of a mass grave. A search at the home turned up nothing.