How to tell 'PowerShell' Copy-Item to unconditionally copy files

The following PowerShell script works if the resources are not there.

  Copy-Item $src_dir $dst_dir$agent_folder -recurse

But if the resources are there, it will say:

+   Copy-Item <<<<  $src_dir $dst_dir$agent_folder -recurse
    + CategoryInfo          : ResourceExists: (C:\Users\Pac\Desktop\Agents\Agent0\lib:S
   tring) [Copy-Item], IOException
    + FullyQualifiedErrorId : DirectoryExist,Microsoft.PowerShell.Commands.CopyItemComm
   and

What do I have to add to the command so that it will unconditionally copy the files?