Researchers did not find a link between using the drug and developing anxiety, however.
Michelle Carter had texted her boyfriend: "You just have to do it," before he killed himself.
The bombing came just weeks after President Donald Trump declared victory over ISIS and ordered a withdrawal of U.S. forces from Syria.
McKenzie Nicole Adams was a smart, outgoing girl who dreamt of becoming a scientist when she was older, her family said.
"Remarkably, however, over the last ten years Mr. Choochongkol has primarily relied on his participation in human drug trials in order to support him and his wife."
Six people were found dead at a farmhouse and a seventh under a nearby bridge.
The Fine Arts teacher was found "alone and unconscious" in his classroom on Monday. He died in hospital.
"Reports that we ordered anyone related to the Saudi sisters...to leave the US for seeking asylum are absolutely false," an embassy spokesperson said.
Naomi Carmichael was initially charged with domestic violence before police revealed the disturbing incident.
The suspect allegedly used a homemade bomb to kill himself, his 2-year-old son and another man.
"Domestic violence has no place in our society," said Sheriff Chad Chronister. His colleague, Kirk Keithley, was believed to be the shooter.
A day after the archbishop of Rouen called on a priest to confess his "inappropriate conduct" towards a young woman, the clergyman was found dead in church.
The move comes as poor conditions are allegedly leading to an increase in self-harm among children.
"This is the new normal, if you look across the country," said Kern County sheriff Donny Youngblood.
Moscow postal worker Ilya Sidorov facing three years of hard labor for taking part in the infamous Blue Whale Challenge.
Brazil, Colombia, Guatemala, Mexico, Venezuela and the U.S. together accounted for half of the 251,000 gun deaths in 2016.
Katie Stubblefield, 21, has become the youngest person in the U.S. to receive a face transplant.