Cataldo said he complained again when some boys at school kicked 7-year-old Zachary in the stomach three months ago but got no response.
Now - two days after an older student slammed Zachary against a tree, fracturing his skull and sending the first-grader to intensive care - Cataldo is hiring a lawyer, and school officials are paying attention.
"This is the only way they'll listen," Cataldo said. "I'm scared for my son."
Microbiologist Dr Peter Wilson said a keyboard was often "a reflection of what is in your nose and in your gut".
During the Which? tests in January this year, a microbiologist deemed one of the office's keyboards to be so dirty he ordered it to be removed, quarantined and cleaned.
Some students at Centennial High School have shaved vertical lines into their eyebrows in a trend recently made popular by hip-hop star Soulja Boy. School officials say the mark looks like a gang symbol.
Centennial administrators are telling students with the lines that they can't return to school until they shave their eyebrows off. Assistant Principal Mark Porterfield said the students are not suspended, but they are not allowed in school until they cooperate.
Four students have been sent home. One returned with a bandage covering the shaved brow.
Dave, this one's for you.
"A big, fat zero," said a visibly flummoxed Commissioner John Mack, who is African American and the former president of the Los Angeles Urban League. "In my mind, there is no such thing as a perfect institution . . . I find it baffling that we have these zeros."
His disbelief, echoed by other commissioners, drew a quick response from Police Chief William J. Bratton. Unsolicited, he told the commission he would have his staff conduct a survey of other large, urban police departments, as well as the Los Angeles County Sheriff's Department, to back up his belief that the findings in the LAPD are similar elsewhere.
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