Even when we are aware of them, certain situations (like the new consultant in my case) can trigger them anyway.

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"We find time has been an ally, " says Sergeant Bill Tanton, a 23-year veteran of the Sacramento Police Department and a consultant for the California Cold Case Investigation Course, a training program that specializes in solving open cases.

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To be fair, the NLRB did not consider the attorney-client privilege in Banner Health, presumably because the case involved investigations conducted by a human resources consultant, not an attorney.

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Patent consultant Florian Mueller said this was the first clear case of Google suing another company over its patents.

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Solicitor general Lesley Thomson QC, prosecuting, asked the consultant if the police would be contacted in a case where a patient was taken to hospital with all of these injuries.

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Patrick O'Brien, a consultant obstetrician at University College London Hospitals, said such a case would be seen about "once a year" - but there there were no accurate figures.

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The consultant paediatrician told BBC Breakfast that the hospital saw about one severe case a month of rickets - softening of bones through lack of vitamin D in childhood.

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Even so, Naomi Starkman, a food media consultant to Consumers Union, said in a statement that the documented case of a BSE positive cow raised serious questions about the future safety of U.S. beef.

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Resnick testified that he previously worked as a consultant for the defense in the Susan Smith murder trial -- the case of the South Carolina mother who rolled her car into a lake, killing her two sons.

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Julie Blackman, a litigation consultant with DOAR Litigation Consulting LLC in New York, said depositions from this case and others could complicate the criminal prosecution.

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David Cannon, a Los Angeles-based trial consultant, discovered on blogs that a potential juror in a personal-injury case had made extensive attempts to contact extraterrestrials.

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Consultant Mr Roberts who was overseeing the operation said he was going to check the case notes.

BBC: Fatal kidney error trial continues