diff --git a/src/SourceBuild/content/eng/tools/tasks/Microsoft.DotNet.SourceBuild.Tasks.LeakDetection/CheckForPoison.cs b/src/SourceBuild/content/eng/tools/tasks/Microsoft.DotNet.SourceBuild.Tasks.LeakDetection/CheckForPoison.cs
index cf16890ce..dab29fae4 100644
--- a/src/SourceBuild/content/eng/tools/tasks/Microsoft.DotNet.SourceBuild.Tasks.LeakDetection/CheckForPoison.cs
+++ b/src/SourceBuild/content/eng/tools/tasks/Microsoft.DotNet.SourceBuild.Tasks.LeakDetection/CheckForPoison.cs
@@ -152,8 +152,6 @@ namespace Microsoft.DotNet.SourceBuild.Tasks.LeakDetection
 
         private const string SbrpAttributeType = "System.Reflection.AssemblyMetadataAttribute";
 
-        private const string SbrpAttributeValuePattern = "source\\s?source\\-build\\-reference\\-packages";
-
         private record CandidateFileEntry(string ExtractedPath, string DisplayPath);
 
         public override bool Execute()
@@ -370,11 +368,17 @@ namespace Microsoft.DotNet.SourceBuild.Tasks.LeakDetection
 
             if (attributeType == SbrpAttributeType)
             {
-                BlobReader blobReader = reader.GetBlobReader(attr.Value);
-                string attributeValue = Encoding.UTF8.GetString(blobReader.ReadBytes(blobReader.Length));
-                attributeValue = Regex.Replace(attributeValue, @"\p{C}+", string.Empty);
-                return Regex.IsMatch(attributeValue, SbrpAttributeValuePattern);
+                var decodedValue = attr.DecodeValue(DummyAttributeTypeProvider.Instance);
+                try
+                {
+                    return decodedValue.FixedArguments[0].Value.ToString() == "source" && decodedValue.FixedArguments[1].Value.ToString() == "source-build-reference-packages";
+                }
+                catch
+                {
+                    throw new InvalidOperationException($"{SbrpAttributeType} is not formatted properly with a key, value pair.");
+                }
             }
+
             return false;
         }
 
diff --git a/src/SourceBuild/content/eng/tools/tasks/Microsoft.DotNet.SourceBuild.Tasks.LeakDetection/DummyAttributeTypeProvider.cs b/src/SourceBuild/content/eng/tools/tasks/Microsoft.DotNet.SourceBuild.Tasks.LeakDetection/DummyAttributeTypeProvider.cs
new file mode 100644
index 000000000..6f352c88b
--- /dev/null
+++ b/src/SourceBuild/content/eng/tools/tasks/Microsoft.DotNet.SourceBuild.Tasks.LeakDetection/DummyAttributeTypeProvider.cs
@@ -0,0 +1,34 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Reflection;
+using System.Reflection.Metadata;
+using System.Reflection.Metadata.Ecma335;
+
+namespace Microsoft.DotNet.SourceBuild.Tasks.LeakDetection
+{
+
+    // An empty ICustomAttributeTypeProvider implementation is necessary to read metadata attribute values.
+    internal class DummyAttributeTypeProvider : ICustomAttributeTypeProvider<Type>
+    {
+        public static readonly DummyAttributeTypeProvider Instance = new();
+
+        public Type GetPrimitiveType(PrimitiveTypeCode typeCode) => default(Type);
+
+        public Type GetSystemType() => default(Type);
+
+        public Type GetSZArrayType(Type elementType) => default(Type);
+
+        public Type GetTypeFromDefinition(MetadataReader reader, TypeDefinitionHandle handle, byte rawTypeKind) => default(Type);
+
+        public Type GetTypeFromReference(MetadataReader reader, TypeReferenceHandle handle, byte rawTypeKind) => default(Type);
+
+        public Type GetTypeFromSerializedName(string name) => default(Type);
+
+        public PrimitiveTypeCode GetUnderlyingEnumType(Type type) => default(PrimitiveTypeCode);
+        
+        public bool IsSystemType(Type type) => default(bool);
+    }
+}
diff --git a/src/SourceBuild/content/test/Microsoft.DotNet.SourceBuild.SmokeTests/assets/baselines/PoisonUsage.txt b/src/SourceBuild/content/test/Microsoft.DotNet.SourceBuild.SmokeTests/assets/baselines/PoisonUsage.txt
index fee5ec5e8..f1ab9ecc1 100644
--- a/src/SourceBuild/content/test/Microsoft.DotNet.SourceBuild.SmokeTests/assets/baselines/PoisonUsage.txt
+++ b/src/SourceBuild/content/test/Microsoft.DotNet.SourceBuild.SmokeTests/assets/baselines/PoisonUsage.txt
@@ -1,14 +1 @@
-<PrebuiltLeakReport>
-  <File Path="artifacts/x64/Release/dotnet-sdk-x.y.z-banana-rid.tar.gz/sdk/x.y.z/DotnetTools/dotnet-format/Microsoft.Bcl.AsyncInterfaces.dll">
-    <Type>SourceBuildReferenceAssembly</Type>
-  </File>
-  <File Path="artifacts/x64/Release/Private.SourceBuilt.Artifacts.x.y.z/dotnet-format.x.y.z.nupkg/tools/netx.y/any/Microsoft.Bcl.AsyncInterfaces.dll">
-    <Type>SourceBuildReferenceAssembly</Type>
-  </File>
-  <File Path="artifacts/x64/Release/Private.SourceBuilt.Artifacts.x.y.z/Microsoft.TestPlatform.CLI.x.y.z/contentFiles/any/netx.y/Microsoft.Extensions.DependencyModel.dll">
-    <Type>SourceBuildReferenceAssembly</Type>
-  </File>
-  <File Path="artifacts/x64/Release/Private.SourceBuilt.Artifacts.x.y.z/Microsoft.TestPlatform.CLI.x.y.z/contentFiles/any/netx.y/Microsoft.Extensions.FileSystemGlobbing.dll">
-    <Type>SourceBuildReferenceAssembly</Type>
-  </File>
-</PrebuiltLeakReport>
\ No newline at end of file
+<PrebuiltLeakReport />
\ No newline at end of file