"After investigation" is correct and can be used in written English.
It is usually used when referring to a process by which information is obtained. For example, "After investigation, it was concluded that the financial statement was accurate."
(After investigation, both brothers were arrested on separate charges, but the way)." "Thankfully, nobody was injured".
After investigation we can find no evidence that an issue exists with our IT system and we have provided Local Authorities with updated guidance as an additional safeguard.
"After investigation, the Bank of America was unable to assure itself of the validity and collectability of the notes and refused the trust's request," the court was told.
After investigation, we found that σ i (f) was limited in its measure.
After investigation of the incident, this sticker was available due to a bug in our content moderation filters specifically affecting GIF stickers.
After investigation this was ruled out because: (1) the effort for approach users would be greater, and (2) the tailored metamodel would be less intuitive.
After investigation we found that there are only few studies of different fine particles composition on the effect of the sand control.
After investigation it was concluded that the cause of this void was due to the improper construction of utility networks that caused leakage from an old water pipe underneath.
After investigation of the critical paths and duplicated tasks, suggestions were proposed to add resources to critical tasks and to eliminate duplicated tasks by having only one department do them for all departments.
After investigation into his political activities, specifically his membership in the Philomaths, in 1824 Mickiewicz was banished to central Russia.
After investigation, the problems were attributed to poor workmanship during construction as the North British Locomotive Company underquoted production costs to gain the contract.
