Hugo Chávez says he did not accuse the United States of spreading cancer to South American leaders. Instead, he just hypothesized it.
"Lo que he dicho es que me parece muy extraño que en tan corto tiempo nos haya dado cáncer a (Fernando) Lugo, a Dilma (Rousseff), a Chávez, Lula (Da Silva) y después a Cristina. Yo no he acusado a Estados Unidos, ni a nadie, sólo lancé una hipótesis"
This is a distinction that made me think of academia. Was he planning on figuring out a way to test his hypothesis? It's not clear to me where the line is between an accusation and a hypothesis. With both, you have reason to believe a causal relationship and you look for evidence to support it. I plan to use this in articles--I am not accusing you of having a faulty argument, I am just hypothesizing it!
At any rate, as it turns out Cristina Fernández does not have cancer (nice presidential doctors!) so the hypothesis is not testing well.