>>64177327
>And how did he manage to buy the weapons legally while being on SSRI's?

You can only be prohibited from purchasing firearms in the United States if

>you are not a permanent legal resident
>you are a convicted felon (even then, you can have your gun rights restored provided it's not violence/drug-related)
>you have a drug-related criminal conviction of any kind or are a licensed user of medical marijuana
>you have a domestic violence criminal conviction of any kind
>you have a standing restraining order
>you have been subjected to involuntarily institutionalization or 5150'd (even then you can get gun rights restored after a set number of years)
>you have been adjudicated (declared by a judge) as being mentally unfit to possess one

Taking medication or seeking mental health treatment on its own cannot preclude you from owning a firearm