Spain's Interior Ministry suspended the second phase of an electric shock experiment on violent prisoners that could curb aggression.
The pilot study was started at Huelva Prison in the southwest of the country in 2016. The first phase of the experiment was carried out on 41 inmates, 18 of them were serving sentences for murder.
It consisted in strapping electrodes to the inmates head and supplying the brain with an electric current of 1.5 milliamps for 15 minutes a day over the course of three days.
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