What's the meaning of 「確認というか念を押しとくが」?


> 確認というか念を押しとくが

I don't really get the meaning of this sentence. Does it mean _to remind_ ,
_to confirm something_ , or _to make sure of something_?

The whole sentence is:

> そう言えば 確認というか念を押しとくが

The context: two friends are talking and suddenly one says this line, changing
the topic of the conversation.




It is, to make sure of something or to confirm with no doubt

> 刑事は、最後にこう言った。もう一度、確認というか念を押しておきたいのですが、あなたは、事件のあった当日は、勤務先を、午後5時半ごろに、退社したのですね？
>
> The detective said. 'I want to make sure that you left your employer's
> office at 5:30pm that day. Is that correct?'

