Both were called to give evidence of the first day of the committee hearing, which will also hear from a number of other witnesses.
So, federal rules of evidence give a lot of leeway to prosecutors in this area.
The 17-year-old is the last of six alleged victims to give evidence in the trial of nine men accused of grooming and exploiting girls for sex in Oxford.
Mr Laidlaw, who is a non-executive director of the DfT, is due to give evidence to the House of Commons transport committee next week.
Mr Levy's widow, Tina, was forced to give evidence a total of five times.
At first sight, it is true, the events of the past few days give little evidence that a spirit of reason or compromise can be applied to what is certainly a complex issue one, indeed, that has plunged the Greek government into crisis, after allegations that some of its ministers had colluded in Mr Ocalan's entrapment.
The very fact of requiring ministers and their officials to give evidence has often resulted in changes of policy.
The coroner has requested that they give evidence for the sake of completeness.
He asked for trial dates to be postponed so that experts could be available to give evidence about the use of police batons.
They do not require that companies give evidence about the safety of their products, but assume safety as long as the opposite is not proven.
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And it doesn't mean an indictment is inevitable, but now it means that people will be required to give evidence or face contempt of court charges or will have to evoke their Fifth Amendment rights.
The transport secretary said the investigation by Mr Laidlaw - who will give evidence to the House of Commons Transport Select Committee on 18 December - found department officials "wrongly calculated the amount of risk capital bidders would have to offer to guarantee their franchise proposals".
When Hyde was jailed in February 2012 for three years, Judge Patrick Lynch QC told him that if he had not agreed to identify the alleged culprits in Mr O'Hagan's murder and give evidence about the activities of the outlawed LVF, he would have been jailed for 18 years.
Liverpool chose not to give evidence but in court excerpts of his diary were read out.
Mr McDonnell, who is an MP on the Northern Ireland Affairs Committee, switched roles to give the committee evidence on behalf of his party.
They are looking for smartphones, GPS devices, computer tablets or other items that could "give the investigators some electronic evidence of what happened in the last minutes of flight, " he said.
Investigators are also looking for smartphones, GPS devices, computer tablets or other items that could "give the investigators some electronic evidence of what happened in the last minutes of flight, " he said.
Several of those involved, Thomas Docherty, Charlie Elphicke and Ben Gummer will give evidence about the whacky procedures for this kind of legislation.
Esack, of Rosewood Drive, declined to give evidence at his trial but had told police he had intended to kill himself in front of her after being badly affected by her beginning a new relationship after the couple had split up.
Ms Lees, who works with people with learning difficulties in East Sussex, has travelled thousands of miles to give evidence.
Ofqual is expected to give evidence on Thursday, the final day of the hearing.
He said it was difficult for members and former members of the IRA to give evidence because they were sworn to secrecy.
Medics involved in treating Mrs Halappanavar will be called to give evidence along with experts including former master of the National Maternity Hospital Dr Peter Boylan.
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Mr Jamil, who said he had been known as K-dog since the age of 17, was the first of the defendants to give evidence in the trial.
"I've been taking phone calls from social workers and other health care professionals who say it would be a routine part of their work to give evidence in very complex court cases, " she said.
Connecting the advice doctors give to the scientific evidence is the point of a new commentary on obesity appearing this week in the electronic edition of the respected New England Journal of Medicine (NEJM), Myths, Presumptions, and Facts About Obesity.
Professor David Heald of the University of Aberdeen was next to give evidence on the spending review.
About 76 witnesses will be called to give evidence, including the serving and former head of the Prison Service.
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Ms Kelly, who was the first witness to give evidence in the trial, told the jury of the moments just before her son's death on 25 May.
The unemployed labourer did not give evidence but the jury heard a tape recording of his interview with police in which he claimed the woman had been a willing partner.
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