In chronic arsenic poisoning the following samples can be sent for laboratory examination, except -: (A) Nail clipping, (B) Hair samples, (C) Bone biopsy, (D) Blood sample
Answer is D. Arsenic is rapidly cleared from blood.so a blood sample is only useful for acute poisoning Ref: K.S.Narayan Reddy's Synopsis of Forensic Medicine and Toxicology, 29th edition, Chapter 26, page 295.