One study concluded that as many as one in four zoo visitors razz the animals in some way, and large predators like tigers are a prime target.
Paul Dhaliwal, one of the two surviving victims, told the father of the teenager killed in the Christmas Day attack that while the three climbed the 3-foot-tall railing and tried to get the tiger's attention, they never threw or dangled anything into the pen, according to a search warrant affidavit filed late Thursday.
Dhaliwal, 19, was severely injured when the 250-pound Siberian tiger named Tatiana clawed its way up the wall of its enclosure, leapt out and mauled him. His brother, Kulbir, 24, was also injured, and their friend, 17-year-old Carlos Sousa Jr., was killed.
The tiger "may have been taunted/agitated by its eventual victims," Inspector Valerie Matthews wrote in the affidavit. Police believe "this factor contributed to the tiger escaping from its enclosure and attacking its victims," she wrote.
All three victims had marijuana in their systems, and Paul Dhaliwal's blood alcohol level was 0.16
- twice the legal limit for driving, according to the affidavit.
"Clearly there's the lesson to be learned here," said zoo spokesman Sam Singer. "The lesson is that it's not a good idea to drink, it's not a good idea to be high on dope, and it's not a good idea to taunt a man-eating tiger."
Authorities were weighing whether to seek criminal charges against the Dhaliwals, but their lawyer, Mark Geragos, said they have presented no evidence of a crime. Geragos, who has repeatedly said the brothers didn't taunt the tiger, also noted that the affidavit does not specify any possible counts.
"Basically, they're arguing that if you go to the zoo and wave at the animals, you get the death penalty," he said. "And that's just nonsense."
David Kestenbaum, a criminal defense attorney in Los Angeles who has followed the case, said investigators could be pursuing misdemeanor charges related to possessing marijuana, trespassing or giving alcohol to a minor.
"I don't see a felony based on the facts that are public at this point," Kestenbaum said.
Some animal behaviorists said Friday that the visitors' alleged actions would not exonerate the zoo or its accrediting agency, the Association of Zoos and Aquariums.
Zoo officials have acknowledged the wall surrounding the tiger's open-air enclosure was four feet lower than recommended by the AZA. The same tiger ripped the flesh off a zookeeper's arm in December 2006. After that attack, the zoo revamped the bars enclosing the indoor cages where she and other big cats were kept.
"Taunting or not, I just think it's incumbent on the AZA and the zoos to have taunt-proof cages," said wildlife biologist Marc Bekoff, a professor emeritus of ecology and evolutionary biology at the University of Colorado, Boulder. "If you are going to have an animal like a Siberian tiger or other predators, you have to protect the public."