Aspelin, who was accused of causing the death of his infant son, had one thing in his favor: He had enough money to pay for medical experts who cast doubt on the prosecution's theory.

Dismissed case raises questions about shaken baby diagnosis.

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Our instincts are to protect and defend defenseless children. These combinations have led to countless criminal convictions: parents, day care providers, teachers, neighbors---even when the charges cannot be supported by objective scientific evidence, or when there was no physical evidence at all to support the claims.

That tendency is even stronger when the accused must prove a negative---that what he or she is accused of didn't happen---and the accuser is a physician with a stack of degrees or, equally potent, a child.

More importantly, the Medical Examiner who testified against him changed his mind.

The Arizona Court of Appeals has tossed Drayton's conviction, and barred the state from retrying him. In 1999, Pamela Jacobazzi, a Bartlett, IL day care provider, was convicted of killing 10-month-old Matthew Czapski after the child lapsed into a coma while in her care and later died.

20 years later, Mary's case is still garnering national attention.

When San Francisco prosecutors dismissed charges against Kristian Aspelin in early December, 2012, it became just the latest case to raise questions about how shaken baby syndrome is diagnosed.

His 2006 conviction was thrown out because the trial judge refused to provide him funds to hire an expert.

In 2007, when 4-month-old Lincoln Wilber died in her care, Jennifer Hancock of Verona, WI quickly became authorities' only suspect. Michael Stier, who performed Lincoln's autopsy, testified the baby's subdural hematoma Medical experts reviewing evidence in the 2007 death of 4-month-old Lincoln Wilber disagree about what may have caused the infant to become unresponsive while in the care of his provider, Jennifer Hancock.

He was released on bail into the arms of his loved ones, telling the media, "I just want to be with my family." UPDATE: September 16, 2011 -- The prosecutor has dropped all charges against Mr. Michael Mc Gee, who has served as the county's chief medical examiner for 26 years, after a Douglas County judge found he gave false testimony in a murder trial.

Mc Gee's testimony helped secure the conviction of Michael Hansen for the murder of his infant daughter in 2004. It took a jury only 2 hours to acquit former daycare provider Deborah Parlock, of Chesterton, Indiana, of shaking a 6-month-old child in her care and causing his death.

Thousands nationwide have been prosecuted for harming or killing small children in this way.