diff --git a/src/detections/detection.rs b/src/detections/detection.rs
index 683d62dd..7d61a1d4 100644
--- a/src/detections/detection.rs
+++ b/src/detections/detection.rs
@@ -1,3 +1,4 @@
+extern crate csv;
 extern crate quick_xml;
 
 use crate::detections::application;
@@ -11,7 +12,6 @@ use quick_xml::de::DeError;
 use std::collections::BTreeMap;
 use std::fs::File;
 use std::io::prelude::*;
-extern crate csv;
 
 #[derive(Debug)]
 pub struct Detection {
diff --git a/src/detections/powershell.rs b/src/detections/powershell.rs
index 3cc54337..df9edf53 100644
--- a/src/detections/powershell.rs
+++ b/src/detections/powershell.rs
@@ -41,14 +41,13 @@ impl PowerShell {
                 Regex::new("(?ms)^.*(ホスト アプリケーション|Host Application) = ").unwrap();
             let rm_after = Regex::new("(?ms)\n.*$").unwrap();
 
-            let temp = rm_before.replace_all(commandline, "");
-            let command = rm_after.replace_all(&temp, "");
+            let temp_command_with_extra = rm_before.replace_all(commandline, "");
+            let command = rm_after.replace_all(&temp_command_with_extra, "");
 
             if command != "" {
                 utils::check_command(4103, &command, 1000, 0, &default, &default, rdr);
             }
         }
-        return;
     }
 
     fn execute_remote_command(
@@ -61,11 +60,8 @@ impl PowerShell {
         let message_num = event_data.get("MessageNumber");
         let commandline = event_data.get("ScriptBlockText").unwrap_or(&default);
 
-        match message_num {
-            Some(_) => utils::check_command(4104, &commandline, 1000, 0, &default, &default, rdr),
-            _ => {}
+        if let Some(_) = message_num {
+            utils::check_command(4104, &commandline, 1000, 0, &default, &default, rdr);
         }
-
-        return;
     }
 }
diff --git a/src/detections/utils.rs b/src/detections/utils.rs
index c18378c8..ba9aaf39 100644
--- a/src/detections/utils.rs
+++ b/src/detections/utils.rs
@@ -228,7 +228,6 @@ mod tests {
         let mut rdr = csv::Reader::from_reader(contents.as_bytes());
         utils::check_command(1, "dir", 100, 100, "dir", "dir", &mut rdr);
 
-        let mut rdr = csv::Reader::from_reader(contents.as_bytes());
         //test return with whitelist.
         utils::check_command(
             1,