Why were there investigations into whether Yasser Arafat had been poisoned?

Investigations into the death of Yasser Arafat were prompted by widespread skepticism regarding the official cause of his illness and death in 2004. Following his passing in a Paris hospital, doctors were unable to identify the specific origin of his ailment, and no autopsy was performed at the time, which fueled rumors of foul play among his supporters.1

These suspicions intensified in 2012 when a Swiss laboratory reported finding elevated levels of polonium-210 on his personal belongings. In response to a request from his widow, French prosecutors opened a murder investigation, leading to the exhumation of his remains later that year for testing by international teams of experts.1

The subsequent reports were contradictory:
* Russian investigators found no traces of polonium-210.1
* Swiss experts concluded that poisoning could not be ruled out due to high levels of the substance.1
* French investigators acknowledged the presence of polonium-210 but concluded it was likely environmental in origin.1

Each report faced significant controversy, including allegations of political interference and concerns regarding the integrity of the evidence's "chain of custody" over the years.1