This may have been due to the extraneously
introduced epithelial cells being distributed rapidly into CSF soon after introduction such that discarding a few drops of CSF did not reduce the epithelial cell load, or because CSF backflow was of insufficient force or volume to dislodge epithelial cells adherent to the bevel or lumen of the needle.
The experience here is that we defend our own and that development is auto-centered, being geared to internal needs, and where extraneously
driven development has meant development based on fossil fuels and mineral extraction in a zero sum, leading to a race to the bottom, hence:
We must consider the relationship of ethics to the law so that we can analyze ethical, or self imposed limitations on behavior, to legal, or extraneously
imposed restraints, on governmental conduct.