Born in the Netherlands, Verwoerd is South Africa's only foreign-born prime minister. He was the second child of Anje Strik and Wilhelmus Johannes Verwoerd; he had an elder brother named Leendert and a younger sister named Lucie. His father was a shopkeeper and a deeply religious man who decided to move his family to South Africa in 1903 because of his sympathy towards the Afrikaner nation in the wake of the Second Boer War. Verwoerd went to a Lutheran primary school in Wynberg, a suburb of Cape Town.

On 9 April 1960, Verwoerd opened the Union Exposition in Milner Park, Johannesburg, to mark the jubilee of the Union of South Africa. After Verwoerd delivered his opening address, David Pratt, a rich English businessman and farmer from the Magaliesberg, near Pretoria, attempted to assassinate Verwoerd, firing two shots from a .22 pistol at point-blank range, one bullet perforating Verwoerd's right cheek and the second his right ear. Colonel G. M. Harrison, president of the Witwatersrand Agricultural Society, leapt up and knocked the pistol from the gunman's hand. After the pistol fell to the floor, Harrison, with the help of Major Carl Richter, the Prime Minister's personal bodyguard, civilians and another policeman overpowered the gunman. He was taken to the Marshall Square police station and later transferred to the Forensic Medical Laboratory due to his peculiar behaviour. Within minutes of the assassination attempt, Verwoerd--still conscious and blood gushing from his face--was rushed to the nearby Johannesburg Hospital. Two days later, the hospital issued a statement which described his condition as 'indeed satisfactory--further examinations were carried out today and they confirm good expectations. Dr. Verwoerd at present is restful. There is no need for any immediate operation.' Once his condition stabilised, Verwoerd was transferred to a Pretoria Hospital. The neurologists who treated Verwoerd later stated that his escape had been 'absolutely miraculous'. Specialist surgeons were called in to remove the bullets. At first, there was speculation that Verwoerd would lose his hearing and sense of balance, but this was to prove groundless. He returned to public life on 29 May, less than two months after the shooting. David Pratt was initially held under the emergency regulations, declared on 30 March 1960, nine days after the Sharpeville massacre and shortly after Verwoerd received a death threat with a red note reading, "Today we kill Verwoerd". Pratt appeared for a preliminary hearing in the Johannesburg Magistrates' Court on 20 and 21 July 1960, once it was clear that the attempt was not fatal. Pratt claimed he had been shooting 'the epitome of apartheid'. However, in his defence, he stated he only wanted to injure, not kill, Verwoerd. The court accepted the medical reports submitted to it by five different psychiatrists, all of which confirmed that Pratt lacked legal capacity and could not be held criminally liable for having shot the prime minister. On 26 September 1960, he was committed to a mental hospital in Bloemfontein. On 1 October 1961, his 53rd birthday, he committed suicide, shortly before parole was to be considered. CANNOTANSWER

Answer the following question by taking a quote from the article: Why couldn't he be held liable?

The court accepted the medical reports submitted to it by five different psychiatrists, all of which confirmed that Pratt lacked legal capacity