21.   After their diagnostic procedure the colonoscope was positioned at site of infusion and a second blood sample collected.

22.   In safety and cost conscious laboratories, the manipulations of the blood sample involved in measurement of this non-specific test may outweight the apparent simplicity of the technique.

23.   At the start of each trial, blood samples were collected to establish baseline serum retinol concentrations.

24.   Soon all the blood samples were taken, and labelled.

25.   The men, who match descriptions of the rapist, have all agreed to give a blood sample.

26.   The blood samples have been sent to the Home Office forensic laboratory in Aldermaston.

27.   Home Office pathologist Dr Alan Williams said Andrew had died from ecstasy poisoning and that blood samples taken from his body had revealed a massive amount of the drug.

28.   He compared the samples with a blood sample from Mr Nichol.

29.   And he testified that, back at the lab, blood samples were placed in an unlocked cabinet for hours.

30.   And most of the mycoplasma agent invades tissue rather than blood cells, requiring an extraordinarily sensitive detection process to confirm its presence in blood samples.