およがせ捜査 そうさじゃありませんでした
oyogasesōsajārimasendeshita

Noun
Desu Copula

The polite, past negative form of 泳がせ捜査

1. Was not an undercover investigation.; Was not allowing [someone/something] to swim/drift.

Past/Perfective
Negative
Polite
Terminal Form