Los Angeles, CA - According to a CBS News/AP report, Alexandra Forbes Kerry, Sen. Kerry's daughter, was arrested in Hollywood on suspicion of driving under the influence of alcohol on Thursday.

Officers contend that Ms. Kerry failed a field sobriety test and was arrested after midnight. Kerry was then booked into the Hollywood police station of the Los Angeles Police Department, where she was held for about five hours before posting $5,000 in bail. During that time, a blood test was taken.

It is important to note that Ms. Kerry, like all persons arrested for impaired driving, is presumed innocent.

It turns out that, according to bodoglife.com, she had a blood alcohol content of 0.06, which is less than California's DUI legal limit of 0.08. While it is still possible, under California DUI Law, for the prosecutor to proceed with a case against Ms. Kerry based on an allegation that she was impaired to the slightest degree by alcohol which affected her driving ability, many would argue that such a prosecution would be more publicity stunt than substance.

The fact that Ms. Kerry "failed a field sobriety test" and then was exonerated by a blood test goes to show what DUI defense attorneys argue every day is real. The field sobriety tests are inaccurate and should not be relied on to estimate a person's alcohol level.

In the field, field testing probably remains a police officer's best tool for deciding whether to arrest and process a person for impaired driving, but attorneys like Seattle DUI Lawyer Aaron Wolff argue that they should be used only as an arrest decision point, and not in court. "The public needs to know that these tests should not be relied on," he said. "It's simply not right to judge a person's ability to drive based on their ability to stand on one leg."

According to NHTSA studies, Standardized Field Sobriety Testing can be anywhere from from 50 to about 90 percent accurate. But DUI forensic experts like Erik Brown explain that the numbers in the studies are misleading based on many factors.