whenever the methodologies of a scientific experiment are repeated the underlying principle is preserved if there is no signifigant deviation of observed results from expected results.

for example PCR has a lot of credit, the central dogma of molecular genetics has a lot of credit, but there are exceptions being found in very niche cases such as reverse transcriptase and the HIV virus.

those experimental protocols that have been reviewed and found to be non deficient at the time of review are often repeated in principle as they are used for a common tool.