Not true. We test isotope ratios every day just to name one.
Incorrect. You can use your theory to make predictions about natural world phenomena that you haven't checked yet. If those predictions come true, and the more the better, the theory is vindicated. If the predictions turn out to be false then back to the drawing board. If you cannot think of any predictions to make then you don't yet have a scientific theory. Evolution has made so many in-advance predictions that it is long past the point where even die-hards like Behe, Denton, and Dembski can deny its truth. That is why Michael Behe said under oath on the stand in the Dover trial that he believes that evolution is true.
I guess then we'll have to throw out anything relating to plate tectonics, star formation, and more. Can't test them in a laboratory you know.
Of course in the laboratory we COULD test how ERV virus DNA gets into genomes. And we COULD test to find such DNA sequences that exist in primates and humans. And we COULD conclude that these got there from common ancestors millions of years ago. But you, being the arbiter of what is, and is not "science", restricts us from concluding anything from those observations.
Sad.
This is why ID theory really means the end of science in the modern world. Because entire sections of the natural world are locked away by political/religious ideologues with agendas.
It's just good that genuine scientists ignore people with such agendas.