They initially brought their 2-year-old daughter to the hospital last month because she was in and out of consciousness.
It happened Sunday evening in Floyd County, Indiana.
Officers searched the home of Paul Stensrud on Thursday.
The Nelson County Sheriff's Office said Miguel Mendez De Leon, 31, and Emmanuel Diaz Sanchez, 32, both of Louisville, were arrested on Saturday, Feb. 5, during a narcotics investigation with Kentucky State Police.
The arrests come after authorities served a search warrant at a home on E. Shoreline Dr. in Floyds Knobs.
Inspectors found it in a semitruck Monday afternoon while they were checking it at a weight station in Porter County, which is in northwest Indiana.
An ISP trooper had pulled over a Jeep being driven by Jesse Brescia, 29, from Lansing, Michigan, for multiple traffic violations when he smelled marijuana coming from the passenger compartment.
An Indiana man who was initially pulled over for the green headlights on his car is arrested for drug possession.
Investigators say in addition to the marijuana, about a pound of cocaine and dozens of guns were also found.