If plaintiff's counsel cannot meet the burden of proof, then they can't claim negligence.
Four "D"s have to be present for a successful malpractice suit:
1. Duty (between provider and patient)
2. Dereliction (standard of care not met)
3. Damages (harm was done)
4. Direction (not meeting the standard of care resulted in the damages done)
States have varying burdens of proof. Some are "beyond a reasonable doubt", some are "more likely than not", some are "willful and wanton". To prove negligence in Texas, you must convince the judge and jury that the negligence was pretty intentional and radical (hence, "willful and wanton"). This is a hard burden to prove.
I am no legal eagle. I can be wrong. Someone else on here please correct me if I am wrong.