Jones left and took a position at a pediatrician's clinic in Kerrville, Texas, some 60 miles northwest of San Antonio. It was here that she was charged with poisoning six children. The doctor in the office discovered puncture marks in a bottle of succinylcholine (Suxamethonium chloride) in the drug storage, where only she and Jones had access. Contents of the apparently full bottle were later found to be diluted. Succinylcholine is a powerful short-acting paralytic that causes temporary paralysis of all skeletal muscles, as well as those that control breathing; the drug is used as a part of general anaesthetic. A patient cannot breathe while under the influence of this drug. In small children, cardiac arrest is the ultimate result of deoxygenation due to lack of respiration.