Investigators to search 155 computers at three schools in ricin deaths case

A mother and her 15-year-old daughter died after being poisoned with ricin.

Investigators will examine 155 computers at three schools for possible searches about the poison and how it could be obtained or used.

They want to learn when any searches took place and who used the computers.

The investigation into the deaths remains open, and no suspect has been named in the double-murder case.