He allegedly also admitted to creating the three complete bombs found in his bedroom.
Markeson said he was "horrified" by the amount of explosive material found in LaDue's room.
According to the report, LaDue proceeded to tell police how he planned to kill his family before his attack on the Waseca Junior and Senior High School. He planned to shoot his mother, father and sister with a .22-caliber rifle because it made less noise. He said he planned to travel to a rural location and start a fire in a field to distract first-responders away from Waseca.
LaDue, a junior at the school, said the next phase of his plan was to travel to the school, where he would detonate pressure-cooker bombs and Molotov cocktails. He allegedly detailed how he planned to set off two different pressure bombs in the schools cafeteria during second lunch period, according to the report.
Each bomb contained cans of WD-40 with one packed with ball bearings and the other bomb packed with metal nuts and nails.
He said he planned to use the firearms he would bring to the school to kill school liaison officer Jared Chrz while he helped injured students. He said he planned to kill as many students as he could while setting off pipe bombs and Molotov cocktails to catch students rushing from the building. He said his ultimate goal was for a SWAT team to kill him.
The notebook entries detail all the information he shared with police, including details of what jobs he could obtain to pay for his equipment and how to disguise bombs in boxes near drinking fountains in the cafeteria.
According to the report, LaDue told police he had been detonating explosive devices in various locations around Waseca in an attempt to perfect his devices, including the CO2 explosive discovered near the Hartley Elementary School playground. Those explosive devices were housed in an Elmo toy and police originally believed they were non-threatening devices constructed by playing children.