Falsification Theory is a Philosophical method created by Karl Popper to separate science from pseudo-science. Popper saw a distingtion between the works of scientists like Einstein and Newton, and the works of Alder, Marx and Freud which claimed to be scientific.
It is easy to find verifications for just about any theory. A man who pushes a child into the water with the intent of drowning it, and a man sacrificing his life to save a child are equally explainable by freudian psychology. Acording to Popper any human action could potentially be justified by Freuds theories.
Confirmations of a theory are only valuable if they are from 'risky predictions', which defy what those not familiar with the thoery would expect. A good scientific theory is one that prohibits a result from happening. For example matter cannot accelerate beyond the speed of light.
If a theory isn't irrefutable by any conceivable means it is not a strength but a weakness. One should attempt to prove a theory wrong, if it can withstand such vigarous attempts to show it's falsehood it must be true (or at least be the likely truth). For example if one wanted to refute the eariler cliam that matter cannot accelerate beyond the speed of light they would only have to show said event occuring. That no one has shown such evidence surgests that such evidence does not exist therefore the theory is true. However if a theory has no test, (which even hypothetically) has the possibility of refuting it, then said theory is pseudo-scientific as it cannot be examined skeptically.The theory's irrefutability simply shows that it is not making substantive claims about the world, which a true scientific theory must.