What began as an investigation into a suspected marijuana-growing farm in Northern California has led to &lt;a href=&#039;http://www.cnn.com/2013/07/30/justice/california-teen-slave&#039;&gt;allegations of a 15-year-old girl being held captive&lt;/a&gt; in a coffinlike metal box and sexually abused. Authorities said the girl sometimes was held in a metal toolbox 4 feet long, 2 feet wide and 2 feet high at the farm, where she worked trimming marijuana plants, in Lake County, north of San Francisco. She told authorities that two men &quot;put her in the box to &#039;teach&#039; her because they had a &#039;point to prove,&#039; &quot; according to a criminal complaint.