It isn't known if Lanza, 20, took medication or used illegal drugs or alcohol.
Search warrant records released by state police do not indicate whether drugs or alcohol were found when investigators searched the Newtown home Lanza shared with his mother Nancy.
Another certificate was found in the home that belonged to Nancy Lanza, 52.
The police dossier compiled in the aftermath of the Sandy Hook massacre reveal Lanza had amassed an astonishing arsenal of guns, with thousands of rounds of ammunition, samurai swords, spears and three photographs of what appear to be a dead person covered in blood.
Search warrant affidavits relating to the Newtown school shootings were unsealed by a judge in Danbury at 9.01am this morning - providing a chilling picture of the mass murderer in the days before he killed 26 people, including 20 children at the Connecticut school in December.
The inventory of the evidence seized from Lanza's home and the car he drove to carry out the massacre provided glimpses into the world of a troubled young man, but it does not answer the question of what could have motivated the attack.
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