After the alleged case of police violence during an operation in Pforzheim, the public prosecutor's office does not expect the results of the investigation too quickly.
A spokesman for the authority said on Tuesday that the work could well be over several weeks.
On Monday, she initiated a preliminary investigation into possible bodily harm in the office.
Pforzheim - The background is an operation on Saturday, in which officials wanted to take a drunk and aggressive 25-year-old into custody.
Video recordings of this are circulating, showing, among other things, a policeman beating the man who is lying on the ground and fixed.
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The Stuttgart police headquarters took over the investigation in order to maintain neutrality.
According to the spokesman, they are initially not directed against a single officer or several officers.
First of all, it will be checked whether the operation was legal overall.
The 25-year-old had suffered minor injuries, according to the police.
Again he injured an officer so badly that he had to stop working.
After the video was published, internet users expressed criticism of the police's crackdown.
dpa