diff --git a/beacon_node/beacon_chain/src/beacon_chain.rs b/beacon_node/beacon_chain/src/beacon_chain.rs
index 7c2336a28b..6ca0bff733 100644
--- a/beacon_node/beacon_chain/src/beacon_chain.rs
+++ b/beacon_node/beacon_chain/src/beacon_chain.rs
@@ -11,7 +11,7 @@ use operation_pool::OperationPool;
 use parking_lot::{RwLock, RwLockReadGuard};
 use slot_clock::SlotClock;
 use ssz::ssz_encode;
-pub use state_processing::per_block_processing::errors::{
+use state_processing::per_block_processing::errors::{
     AttestationValidationError, AttesterSlashingValidationError, DepositValidationError,
     ExitValidationError, ProposerSlashingValidationError, TransferValidationError,
 };
diff --git a/beacon_node/beacon_chain/src/lib.rs b/beacon_node/beacon_chain/src/lib.rs
index 48a42b941e..409b86e028 100644
--- a/beacon_node/beacon_chain/src/lib.rs
+++ b/beacon_node/beacon_chain/src/lib.rs
@@ -13,4 +13,8 @@ pub use db;
 pub use fork_choice;
 pub use parking_lot;
 pub use slot_clock;
+pub use state_processing::per_block_processing::errors::{
+    AttestationValidationError, AttesterSlashingValidationError, DepositValidationError,
+    ExitValidationError, ProposerSlashingValidationError, TransferValidationError,
+};
 pub use types;
diff --git a/beacon_node/network/src/beacon_chain.rs b/beacon_node/network/src/beacon_chain.rs
index 8ec8162ff7..7a8efb2540 100644
--- a/beacon_node/network/src/beacon_chain.rs
+++ b/beacon_node/network/src/beacon_chain.rs
@@ -5,7 +5,7 @@ use beacon_chain::{
     parking_lot::RwLockReadGuard,
     slot_clock::SlotClock,
     types::{BeaconState, ChainSpec},
-    AggregationOutcome, CheckPoint,
+    AttestationValidationError, CheckPoint,
 };
 use eth2_libp2p::rpc::HelloMessage;
 use types::{Attestation, BeaconBlock, BeaconBlockBody, BeaconBlockHeader, Epoch, Hash256, Slot};
@@ -40,7 +40,7 @@ pub trait BeaconChain: Send + Sync {
     fn process_attestation(
         &self,
         attestation: Attestation,
-    ) -> Result<AggregationOutcome, BeaconChainError>;
+    ) -> Result<(), AttestationValidationError>;
 
     fn get_block_roots(
         &self,
@@ -126,14 +126,9 @@ where
 
     fn process_attestation(
         &self,
-        _attestation: Attestation,
-    ) -> Result<AggregationOutcome, BeaconChainError> {
-        // Awaiting a proper operations pool before we can import attestations.
-        //
-        // Returning a useless error for now.
-        //
-        // https://github.com/sigp/lighthouse/issues/281
-        return Err(BeaconChainError::DBInconsistent("CANNOT PROCESS".into()));
+        attestation: Attestation,
+    ) -> Result<(), AttestationValidationError> {
+        self.process_attestation(attestation)
     }
 
     fn get_block_roots(
diff --git a/beacon_node/network/src/sync/simple_sync.rs b/beacon_node/network/src/sync/simple_sync.rs
index 85949fa98e..1afba018d9 100644
--- a/beacon_node/network/src/sync/simple_sync.rs
+++ b/beacon_node/network/src/sync/simple_sync.rs
@@ -563,12 +563,9 @@ impl SimpleSync {
             "peer" => format!("{:?}", peer_id),
         );
 
-        // Awaiting a proper operations pool before we can import attestations.
-        //
-        // https://github.com/sigp/lighthouse/issues/281
         match self.chain.process_attestation(msg) {
-            Ok(_) => panic!("Impossible, method not implemented."),
-            Err(_) => error!(self.log, "Attestation processing not implemented!"),
+            Ok(()) => info!(self.log, "ImportedAttestation"),
+            Err(e) => warn!(self.log, "InvalidAttestation"; "error" => format!("{:?}", e)),
         }
     }