1 - To a drug dog, the smell would be as obvious as sight is to a human.
2 - Thermal scans of houses target people. This was a cop with a drug dog who happened to stop a car.
In Kyllo v. United States, the authorities used thermal imagery to specifically target the house owned by someone they already suspected. And since the house wasn’t going to move away, they had time to get a warrant.
Also:
“The majority opinion argued that a person has an expected privacy in his or her home and therefore, the government cannot conduct unreasonable searches, even with technology that does not enter the home.”
You don’t have a reasonable expectation of privacy while driving a car on a public road.
Horsecrap.
The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no warrants shall issue, but upon probable cause,
Effects covers automobiles:
“Papers” encompass personal items, such as letters and diaries, as well as impersonal business records. “Effects” encompass all other items not constituting “houses” or “papers,” such as clothing, furnishings, automobiles, luggage, etc. The term is less inclusive than “property”; thus, an open field is not an effect.