FolderCompliance.ps1

function Clear-CCTV{
    Param(
    # Directory to clear
    [parameter(mandatory=$true)]
    [string]$Path

    , # Archive Directory Path
    [parameter(mandatory=$true)]
    [string]$ArchivePath

    )
    Begin{
        function Archive {
            # Expand the current date to a folder path.
            $DatePath = (get-date).toString('yyyy/MM/dd')
            # Create the target date folder
            $storePath = join-path $ArchivePath $DatePath
            try{
                new-item -ItemType Directory -Path $storePath -ErrorAction Stop
            } catch [System.IO.IOException]{
                # Directory already exists, which is fine so carry on.
            } catch {
                # All other errors, stop the script.
                Throw $psitem
            }
            $moveList = Get-childItem $Path
            move-item -Path $moveList.fullname -Destination $storePath
        }
    }
    Process{
        # Test there actually is anything to archive before creating a folder.
        if((Get-childItem $Path).length){
            Archive
        }
    }
}

# .date to zero out the hours from the calculated day.
$script:PolicyDeleteDate = (Get-date).addDays(-28).date
function Request-CCTVCompliance{
    Param(
        # Target folder containing files to check
        $Directory
    )
    Begin{
        $contents = Get-childItem -Recurse $Directory -File
    }
    Process {
        $PendingDelete = $contents |
            Select-Object BaseName, CreationTimeUtc, DirectoryName, FullName |
            Where-Object CreationTimeUtc -le $script:PolicyDeleteDate
        $CurrentFiles = $contents |
            Select-Object BaseName, CreationTimeUtc, DirectoryName, FullName |
            Where-Object CreationTimeUtc -gt $script:PolicyDeleteDate

        $output = [pscustomobject]@{
            "Delete" = $PendingDelete | sort-Object CreationTimeUtc
            "Current" = $CurrentFiles | sort-Object CreationTimeUtc
        }
        Write-Output $output
    }
}

line:33 Why use an internal function? Just put that code inside this if it's not a loop or anything.

line:39 This is now a bug, the compliance date is only created at script import, what if you don't re-import it all week?

It should have been a default parameter anyway, which would fix above, make it more flexible for other uses/users and avoided mudying scopes

...mental