The accusation against Fisher was extremely controversial at the time and led some to investigate the claims further.

Their quest leads them to investigate a series of mysterious asphyxiations.

The body of the former owner is discovered in the cellar, leading them to investigate.

His work on sponges led him to investigate their physical structure, and from there the makeup of chalk.

The failure to find a primary radar return for American 77 led us to investigate this issue further.

Someone causes trouble for them or annoys Jack in some way, leading him to investigate.

This led him to investigate methods of controlling blood pressure.

Gabriel's search leads him to investigate the members of the group and search the town.

This led him to investigate ethnic intermarriage as an index of social interaction.

The incidents led the State Legislature to investigate the program.