Popper states that:
...There can be 2 incompatible theory, equally irrefutable; for example, determinism and his opposite, indeterminism.
Popper; Conjecture and Confutation chapter 8.
How can determinism not be a scientific theory, if we can clearly confutate it? For Popper determinism is:
"Future is conteined in the present, because is from it complitelly determined."
This theory is clearly confutable, since we just need one experiment that proves that in just one case something is not determined. Why he calls it a non-scientific theory?