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とりあえず、転入生は自動的に身辺調査をすることにしているんだけどね

This is taken from a visual novel

It translates to "So anyway I decided to to do a background check on the
transfer student"

However I don't get the usage of は in this case.

Using は would mean that the preceding word (transfer student) is the subject
and he/she is doing something.

However the something (investigation) is being done to the transfer student so
shouldn't the を particle be used here instead of は ?
CC BY-SA 3.0
2016-08-06T07:22:53.230
38260
2016-08-07T15:27:48.760
16352
question
particles
Can someone explain the use of は in this sentence?
は does not mark the subject of a verb. It marks the topic of the sentence. The
subject in this case is an implied 'I'.  
The (indirect) object is indeed 'transfer student' but this is also implied.
We don't need to make it explicit because they are already the topic of
conversation.

> As for transfer students _I_ make it a rule to automatically do background
> checks _on them_.

Please check other questions on this site on the difference between は and が
e.g. [this](https://japanese.stackexchange.com/questions/22/whats-the-
difference-between-wa-%E3%81%AF-and-ga-%E3%81%8C).
CC BY-SA 3.0
2016-08-06T10:00:07.923
38261
2016-08-07T15:27:48.760
2017-04-13T12:43:43.857
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answer