A Japanese teenage girl who poisoned her mother and kept a blog diary of her worsening condition is being sent to reform school.
A family court in Shizuoka heard the 17-year-old gave her mother thallium in her tea. The family said they did not want her charged, media reports said.
The girl kept a blog featuring pictures of her victim, who fell into a coma and has not regained consciousness.
The girl held no grudge, just "wanted to experiment", investigators said.
The girl's diary also described poisoning small animals to death.
Remains of some of them were found in formaldehyde in her room in Izunokuni, in Shizuoka prefecture.
'Longing to experiment'
Investigators also found a book about Graham Young, a British serial killer who poisoned dozens of people in the 1960s and 1970s using thallium - which is sometimes used in rat poison.
The girl, who cannot be named for legal reasons, denied the poisoning after her arrest in October but in March admitted trying to kill her mother.
She began the poisoning last August and continued to do so even after her mother was confined to hospital.
Media reports said the girl also poisoned herself to try to evade suspicion.
Presiding Judge Hiroyuki Anegawa said the girl had had "developmental problems" since childhood and needed to "undergo correctional education for a considerably long period".
The girl, the judge added, had poisoned her mother "because of her longing to experiment with thallium".
He added: "She is on the threshold of facing up to the seriousness of what she has done, and we can anticipate that corrective education will be effective."
A senior investigative official was quoted as saying by Japanese newspaper Asahi Shimbun: "She did not hold a grudge against her mother - she just wanted to do an experiment."