diff --git a/src/DICOM.jl b/src/DICOM.jl
index 439432c..de14b51 100644
--- a/src/DICOM.jl
+++ b/src/DICOM.jl
@@ -131,21 +131,10 @@ always_implicit(grp, elt) =
 
 function find_dicom_files(dir)
     files = joinpath.(dir, readdir(dir))
-    dicom_files = []
-    # for file in 1:length(files)
-    #     if isdicom(file)
-    #         push!(dicom_files, file)
-    #     end
-    # end
     dicom_files = filter(file -> isdicom(file), files)
     return dicom_files
 end
 
-# function isdicom(file)
-#     bytes = read(file, 132)[end-3:end]
-#     String(bytes) == "DICM"
-# end
-
 function isdicom(file)
     try
         bytes = read(file, 132)[end-3:end]
diff --git a/test/runtests.jl b/test/runtests.jl
index 898d26e..bc7d6f1 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -232,14 +232,14 @@ end
     @test length(dcms) == length(readdir(data_folder)) - 3 # -3 because of note above
 end
 
-# @testset "isdicom" begin
-#     answer = DICOM.isdicom("test/testdata/brain.bmp")
-#     @test answer === nothing
-
-#     fileDX = download_dicom("DX_Implicit_Little_Interleaved.dcm")
-#     answer2 = DICOM.isdicom(fileDX)
-#     @test answer2 == true
-# end
+@testset "isdicom" begin
+    answer = DICOM.isdicom("test/testdata/brain.bmp")
+    @test answer === false
+
+    fileDX = download_dicom("DX_Implicit_Little_Interleaved.dcm")
+    answer2 = DICOM.isdicom(fileDX)
+    @test answer2 == true
+end
 
 @testset "Test tag macro" begin
     @test tag"Modality" === (0x0008, 0x0060) === DICOM.fieldname_dict[:Modality]