, potassium, calcium, it's also PSA in it, Prostate Specific Antigen and in some case, urine, in some case, it's urine in some case, it's the combination between ejaculated fluid and urine
Are you proposing... that the man was poisoned with potassium cyanide... then the killer waited 7 hours, stabbed him 18 times... and then shot him in the back of the head?