diff --git a/modelscan/issues.py b/modelscan/issues.py
index 16bfb515..9be0dc3e 100644
--- a/modelscan/issues.py
+++ b/modelscan/issues.py
@@ -18,8 +18,14 @@ class IssueSeverity(Enum):
     CRITICAL = 4
 
 
-class IssueCode:
-    UNSAFE_OPERATOR = Property("UNSAFE_OPERATOR", 1)
+class IssueCode(Enum):
+    UNSAFE_OPERATOR = 1
+    INVALID_OPCODE = 2
+    UNUSED_VARIABLE = 3
+    PROTO_NOT_FIRST = 4
+    DUPLICATE_PROTO = 5
+    DUPLICATE_DIFFERENT_PROTO = 6
+    SUSPICIOUS_LOADER = 7
 
 
 class IssueDetails(metaclass=abc.ABCMeta):
@@ -83,11 +89,19 @@ def __hash__(self) -> int:
         )
 
     def print(self) -> None:
-        issue_description = self.code.name
-        if self.code.value == IssueCode.UNSAFE_OPERATOR.value:
-            issue_description = "Unsafe operator"
-        else:
-            logger.error("No issue description for issue code %s", self.code)
+        issue_description_map = {
+            IssueCode.UNSAFE_OPERATOR: "Unsafe operator",
+            IssueCode.INVALID_OPCODE: "Invalid opcode",
+            IssueCode.UNUSED_VARIABLE: "Unused variable",
+            IssueCode.PROTO_NOT_FIRST: "PROTO not the first opcode",
+            IssueCode.DUPLICATE_PROTO: "Duplicate PROTO opcode",
+            IssueCode.DUPLICATE_DIFFERENT_PROTO: "Duplicate PROTO with different version",
+            IssueCode.SUSPICIOUS_LOADER: "Suspicious loader",
+        }
+
+        issue_description = issue_description_map.get(
+            self.code, f"Unknown issue for code {self.code}"
+        )
 
         print(f"\n{issue_description} found:")
         print(f"  - Severity: {self.severity.name}")
@@ -131,19 +145,63 @@ def __init__(
         severity: IssueSeverity,
         source: Union[Path, str],
         scanner: str = "",
+        message: str, 
+        source: Union[str, Path], 
+        opcode: Optional[int] = None
     ) -> None:
         self.module = module
         self.operator = operator
         self.source = source
         self.severity = severity
         self.scanner = scanner
+        self.message = message
+        self.opcode = opcode
+        self.source = source
+
+    def output_lines(self) -> List[str]:
+        lines = []
+        
+        # Include the message if it exists
+        if hasattr(self, 'message') and self.message:
+            lines.append(self.message)
+        
+        # Append the opcode if it exists
+        if hasattr(self, 'opcode') and self.opcode is not None:
+            lines.append(f"Opcode: {self.opcode}")
+        
+        # Include the unsafe operator description if the attributes exist
+        if hasattr(self, 'operator') and hasattr(self, 'module'):
+            lines.append(f"Description: Use of unsafe operator '{self.operator}' from module '{self.module}'")
+        
+        # Append the source
+        lines.append(f"Source: {str(self.source)}")
+        
+        return lines
+
+class UnusedVariableIssueDetails(IssueDetails):
+    def __init__(self, variable: Any, source: Union[str, Path]) -> None:
+        self.variable = variable
+        self.source = source
 
     def output_lines(self) -> List[str]:
         return [
-            f"Description: Use of unsafe operator '{self.operator}' from module '{self.module}'",
+            f"Unused variable in pickle data: {self.variable}",
             f"Source: {str(self.source)}",
         ]
 
+
+class UnsafeLoaderIssueDetails(IssueDetails):
+    def __init__(self, module: str, loader: str, source: Union[str, Path]) -> None:
+        self.module = module
+        self.loader = loader
+        self.source = source
+
+    def output_lines(self) -> List[str]:
+        return [
+            f"Found suspicious loader from {self.source} : {self.module}.{self.loader}",
+            f"Source: {str(self.source)}",
+        ]
+        
     def output_json(self) -> Dict[str, str]:
         return {
             "description": f"Use of unsafe operator '{self.operator}' from module '{self.module}'",