What does that have to do with anything? The report says it was found in his blood so it had to have been consumed in two days or less.
Anything in the urine has to be in the blood to get into the urine. Therefore if thc can be detected in the urine for up to two months in heavy users, it can also be detected in the blood...... The actual blood level may help with timing to last dose, but the simple presence or absence of the substance does not