12:12pm
Letby says she does not recall there were concerns for Child F's blood sugar level in her police interview in 2019.
Mr Johnson says she was aware at the time. Text messages are shown to the court with Letby messaging a colleague about a low blood sugar reading.
NJ: "Had you seen something like this before? Babies having loads of dextrose and still having low blood sugars?"
LL: "Yes."
NJ: "You were trying to [place it as natural causes]."
LL: "I don't think I was trying to provide an explanation."
Letby's message: "Wonder if he has an endocrine problem then."
Mr Johnson: "Does that mean natural causes then?"
LL: "Yes."
Mr Johnson asks about the security of nutrition bags in the fridge, under lock and key. He says they are not safe from someone with a key who can inject 'a tiny amount of insulin' into the bag.
LL: "The bags are sealed and you would have to break the seal to do that."
Mr Johnson asks if that would prevent someone from the previous shift from inserting insulin into the bag.
LL: "I can't say that as I wouldn't put insulin into a TPN bag."
Mr Johnson says the prescribed bag must have been 'tampered with' between 4pm on August 4 and 1am on August 5. The replacement bag was a generic one.
Mr Johnson describes how the insulin could be administered after the bag has been delivered to the ward. One method is after the cellophane wrap has been removed, to which he says that would mean there would be 'very few candidates' who could have done that.
NJ: "Why would you not put insulin in the bags?"
LL: "Because that would go against [all standard practice]."
NJ: "It is highly dangerous.
LL: "Yes."
NJ: "Life-threatening to a child."
LL: "Yes."
NJ: "Something that would never cross the minds of medical staff?"
LL: "At the time? No."
12:14pm
Letby says she "cannot answer" if Child F was deliberately poisoned as she does not know how the insulin got there, who was there, or why.
12:15pm
Mr Johnson asks about the Facebook searches for Child E and Child F's mother carried out in the months after August 4, 2015.
Letby says she got on well with the mother at the time, that she thought about Child E often, and wanted to see how Child F was doing.
12:22pm
Mr Johnson moves to the second insulin case, for Child L, who was a twin to Child M.
Letby's defence statement said she had done nothing wrong and had not deliberately harmed either twin.
Letby agrees this was a case when she challenged doctors if she believed the course of care being given was not correct.
Letby said in her defence statement the unit was "exceptionally busy" on April 9, 2016, the day after Child L and Child M had been born.
Letby said, at the time, she "could not understand" Child L's insulin levels at the time and "could not understand" why there was not an investigation at the time.
12:23pm
Letby denies 'using' the hypoclycaemic pathway not being followed as an 'opportunity' to attack Child L.
12:24pm
Letby says she accepts someone put insulin into the dextrose solution for Child L, and accepts there would be "no reason" for doing this, and that it would be "highly dangerous".
The trial of Lucy Letby, who denies murdering seven babies at the Countess of Chester Hospital neonatal unit and attempting to murder 10 more,…
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