diff --git a/peer/http3/store.go b/peer/http3/store.go
index 2d9a23c..f842437 100644
--- a/peer/http3/store.go
+++ b/peer/http3/store.go
@@ -13,6 +13,9 @@ import (
 	"github.com/lucas-clemente/quic-go/http3"
 )
 
+//ErrNotImplemented is a standard error when a store that implements the store interface does not implement a method
+var ErrNotImplemented = errors.Base("this store does not implement this method")
+
 // Store is a blob store that gets blobs from a peer.
 // It satisfies the store.BlobStore interface but cannot put or delete blobs.
 type Store struct {
@@ -81,17 +84,17 @@ func (p *Store) Get(hash string) (stream.Blob, shared.BlobTrace, error) {
 
 // Put is not supported
 func (p *Store) Put(hash string, blob stream.Blob) error {
-	panic("http3Store cannot put or delete blobs")
+	return errors.Err(ErrNotImplemented)
 }
 
 // PutSD is not supported
 func (p *Store) PutSD(hash string, blob stream.Blob) error {
-	panic("http3Store cannot put or delete blobs")
+	return errors.Err(ErrNotImplemented)
 }
 
 // Delete is not supported
 func (p *Store) Delete(hash string) error {
-	panic("http3Store cannot put or delete blobs")
+	return errors.Err(ErrNotImplemented)
 }
 
 // Delete is not supported
diff --git a/peer/store.go b/peer/store.go
index c227884..6bf3b38 100644
--- a/peer/store.go
+++ b/peer/store.go
@@ -8,6 +8,9 @@ import (
 	"github.com/lbryio/reflector.go/shared"
 )
 
+//ErrNotImplemented is a standard error when a store that implements the store interface does not implement a method
+var ErrNotImplemented = errors.Base("this store does not implement this method")
+
 // Store is a blob store that gets blobs from a peer.
 // It satisfies the store.BlobStore interface but cannot put or delete blobs.
 type Store struct {
@@ -56,17 +59,17 @@ func (p *Store) Get(hash string) (stream.Blob, shared.BlobTrace, error) {
 
 // Put is not supported
 func (p *Store) Put(hash string, blob stream.Blob) error {
-	panic("PeerStore cannot put or delete blobs")
+	return errors.Err(ErrNotImplemented)
 }
 
 // PutSD is not supported
 func (p *Store) PutSD(hash string, blob stream.Blob) error {
-	panic("PeerStore cannot put or delete blobs")
+	return errors.Err(ErrNotImplemented)
 }
 
 // Delete is not supported
 func (p *Store) Delete(hash string) error {
-	panic("PeerStore cannot put or delete blobs")
+	return errors.Err(ErrNotImplemented)
 }
 
 // Delete is not supported
diff --git a/store/cloudfront_ro.go b/store/cloudfront_ro.go
index 51fe4b8..fcc8ed0 100644
--- a/store/cloudfront_ro.go
+++ b/store/cloudfront_ro.go
@@ -93,15 +93,15 @@ func (c *CloudFrontROStore) cfRequest(method, hash string) (int, io.ReadCloser,
 }
 
 func (c *CloudFrontROStore) Put(_ string, _ stream.Blob) error {
-	panic("CloudFrontROStore cannot do writes. Use CloudFrontRWStore")
+	return errors.Err(ErrNotImplemented)
 }
 
 func (c *CloudFrontROStore) PutSD(_ string, _ stream.Blob) error {
-	panic("CloudFrontROStore cannot do writes. Use CloudFrontRWStore")
+	return errors.Err(ErrNotImplemented)
 }
 
 func (c *CloudFrontROStore) Delete(_ string) error {
-	panic("CloudFrontROStore cannot do writes. Use CloudFrontRWStore")
+	return errors.Err(ErrNotImplemented)
 }
 
 // Shutdown shuts down the store gracefully
diff --git a/store/store.go b/store/store.go
index bd9223b..3a2fc6f 100644
--- a/store/store.go
+++ b/store/store.go
@@ -40,3 +40,6 @@ type lister interface {
 
 //ErrBlobNotFound is a standard error when a blob is not found in the store.
 var ErrBlobNotFound = errors.Base("blob not found")
+
+//ErrNotImplemented is a standard error when a store that implements this interface does not implement a method
+var ErrNotImplemented = errors.Base("this store does not implement this method")