Isla Vista, CA. -- We now know police had three prior contacts with 22-year-old Elliott Rodger, one of them less than a month ago. Rodger is the young man police say went on a shooting spree near Santa Barbara, California killing six people, then himself and wounding others on Friday night, out of sexual frustration.

Karen Muller a clinical psychologist in Medford who works with teens and adults says tragedies like this are likely to keep happening.

"This was a very troubled person and we have a free society and this is going to happen sometimes," said Muller.

"It used to be easy to lock people up against their will. Now it's too hard," she continued.

Law enforcement said they checked in on Rodger less than a month before his shooting rampage and that it was at the request of his parents and mental health professional. However Rodger convinced police he was okay.

No arrests were made and Rodger's apartment was never searched.

"If they had the situation they have in Berkeley ... where they've got a mental health worker with them, that would help. Because how can the police be expected to do an expert mental health exam?" said Muller.

Rodger also wrote a 140-page manifesto and posted a YouTube video online, blaming women for his still being a virgin at the age of 22.

"You denied me a happy life and in turn I will deny all of you life," said Rodger in the video.

In Rodger's possession were three 9-millimeter, semi automatic hand guns. All of them were legally purchased.

"We need to look at the availability of guns with people who have mental health problems," said Muller.

Meantime, found in Rodger's car were his guns and more than 400 rounds left over when the rampage, and his life, came to an end.

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