"investigated rigorously" is correct and can be used in written English.
It is typically used to describe the thorough and diligent examination of something. Example: The police department conducted an extensive investigation and evidence was investigated rigorously before making any arrests.
All such cases should be investigated rigorously and promptly, even when they involve former directors of central intelligence.
We show here that the three levels of thermal sensations can be investigated rigorously on psychophysical grounds and believe that such an exploration will have important implications when patients benefit from this approach.
Opportunistic infections such as cryptococcosis can clinically and histologically mimic cutaneous vasculitis and have to be investigated rigorously as a differential diagnosis in immunosuppressed patients.
Serum concentrations of secreted HER ligands and HER receptors have been investigated rigorously as potential prognostic factors and therapeutic indicators for many cancer types.
Since the poor outcome of disseminated cryptococcosis if unrecognized and untreated in time, it should be investigated rigorously as a differential diagnosis in patients with nephrotic syndrome suffering from cutaneous diseases.
Interviews with dozens of officials and athletes in the Olympic movement revealed that the global antidoping watchdog mishandled allegations of widespread corruption, failed to investigate rigorously and was hampered by politics to the point that it was largely ineffective in its mission to protect the integrity of sports.
The main purpose of the current study is to investigate rigorously the above connection without using their interpretation.
If ketamine was shown to have a substantial effect in decreasing acute postoperative pain, a next step would be to investigate rigorously its impact on persistent pain.
The current prevailing cross-sectional studies designed to collect human specimen samples from individual children in the brief precursor time window is not sufficient to generate accurate exposure data that would allow us to investigate rigorously the association with adverse neurologic effects.
"Be it from negligence, lack of training, lack of trust, complicity, these acts cannot be permitted and they are being investigated absolutely rigorously," Mr. Calderón said.
In announcing an investigation of the police's handling of the abuse of children in Rotherham, Ch Con David Crompton said: "A fully independent and impartial investigation is required to ensure that people have confidence that organisations or any individuals will be investigated fairly, rigorously and with complete impartiality".
