diff --git a/lib/stormpy/pomdp/__init__.py b/lib/stormpy/pomdp/__init__.py
index d490e77b4..389565c0a 100644
--- a/lib/stormpy/pomdp/__init__.py
+++ b/lib/stormpy/pomdp/__init__.py
@@ -64,15 +64,18 @@ def create_nondeterminstic_belief_tracker(model, reduction_timeout, track_timeou
         return pomdp.NondeterministicBeliefTrackerDoubleSparse(model, opts)
 
 
-def create_observation_trace_unfolder(model, risk_assessment, expr_manager):
+def create_observation_trace_unfolder(model, risk_assessment, expr_manager, rejection_sampling = True):
     """
 
     :param model:
     :param risk_assessment:
     :param expr_manager:
+    :param rejection_sampling:
     :return:
     """
+    options = pomdp.ObservationTraceUnfolderOptions()
+    options.rejection_sampling = rejection_sampling
     if model.is_exact:
-        return pomdp.ObservationTraceUnfolderExact(model, risk_assessment, expr_manager)
+        return pomdp.ObservationTraceUnfolderExact(model, risk_assessment, expr_manager, options)
     else:
-        return pomdp.ObservationTraceUnfolderDouble(model, risk_assessment, expr_manager)
\ No newline at end of file
+        return pomdp.ObservationTraceUnfolderDouble(model, risk_assessment, expr_manager, options)
\ No newline at end of file
diff --git a/src/pomdp/transformations.cpp b/src/pomdp/transformations.cpp
index 07fa32abc..8ea950f65 100644
--- a/src/pomdp/transformations.cpp
+++ b/src/pomdp/transformations.cpp
@@ -32,9 +32,11 @@ std::shared_ptr<storm::models::sparse::Model<storm::RationalFunction>> apply_unk
 }
 
 template<typename ValueType>
-std::shared_ptr<storm::models::sparse::Mdp<ValueType>> unfold_trace(storm::models::sparse::Pomdp<ValueType> const& pomdp, std::shared_ptr<storm::expressions::ExpressionManager>& exprManager, std::vector<uint32_t> const& observationTrace, std::vector<ValueType> const& riskDef ) {
-    storm::pomdp::ObservationTraceUnfolder<ValueType> transformer(pomdp, exprManager);
-    return transformer.transform(observationTrace, riskDef);
+std::shared_ptr<storm::models::sparse::Mdp<ValueType>> unfold_trace(storm::models::sparse::Pomdp<ValueType> const& pomdp, std::shared_ptr<storm::expressions::ExpressionManager>& exprManager, std::vector<uint32_t> const& observationTrace, std::vector<ValueType> const& riskDef, bool rejectionSampling=true) {
+    storm::pomdp::ObservationTraceUnfolderOptions options = storm::pomdp::ObservationTraceUnfolderOptions();
+    options.rejectionSampling = rejectionSampling;
+    storm::pomdp::ObservationTraceUnfolder<ValueType> transformer(pomdp, riskDef, exprManager, options);
+    return transformer.transform(observationTrace);
 }
 
 // STANDARD, SIMPLE_LINEAR, SIMPLE_LINEAR_INVERSE, SIMPLE_LOG, FULL
@@ -47,6 +49,11 @@ void define_transformations_nt(py::module &m) {
             .value("full", storm::transformer::PomdpFscApplicationMode::FULL)
             ;
 
+    py::class_<storm::pomdp::ObservationTraceUnfolderOptions> unfolderOptions(m, "ObservationTraceUnfolderOptions", "Options for the ObservationTraceUnfolder");
+    unfolderOptions.def(py::init<>());
+    unfolderOptions.def_readwrite("rejection_sampling", &storm::pomdp::ObservationTraceUnfolderOptions::rejectionSampling);
+
+
 }
 
 template<typename ValueType>
@@ -55,12 +62,12 @@ void define_transformations(py::module& m, std::string const& vtSuffix) {
     m.def(("_unfold_memory_" + vtSuffix).c_str(), &unfold_memory<ValueType>, "Unfold memory into a POMDP", py::arg("pomdp"), py::arg("memorystructure"), py::arg("memorylabels") = false, py::arg("keep_state_valuations")=false);
     m.def(("_make_simple_"+ vtSuffix).c_str(), &make_simple<ValueType>, "Make POMDP simple", py::arg("pomdp"), py::arg("keep_state_valuations")=false);
     m.def(("_apply_unknown_fsc_" + vtSuffix).c_str(), &apply_unknown_fsc<ValueType>, "Apply unknown FSC",py::arg("pomdp"), py::arg("application_mode")=storm::transformer::PomdpFscApplicationMode::SIMPLE_LINEAR);
-    //m.def(("_unfold_trace_" + vtSuffix).c_str(), &unfold_trace<ValueType>, "Unfold observed trace", py::arg("pomdp"), py::arg("expression_manager"),py::arg("observation_trace"), py::arg("risk_definition"));
 
     py::class_<storm::pomdp::ObservationTraceUnfolder<ValueType>> unfolder(m, ("ObservationTraceUnfolder" + vtSuffix).c_str(), "Unfolds observation traces in models");
-    unfolder.def(py::init<storm::models::sparse::Pomdp<ValueType> const&,  std::vector<ValueType> const&, std::shared_ptr<storm::expressions::ExpressionManager>&>(), py::arg("model"), py::arg("risk"), py::arg("expression_manager"));
+    unfolder.def(py::init<storm::models::sparse::Pomdp<ValueType> const&,  std::vector<ValueType> const&, std::shared_ptr<storm::expressions::ExpressionManager>&, storm::pomdp::ObservationTraceUnfolderOptions const&>(), py::arg("model"), py::arg("risk"), py::arg("expression_manager"), py::arg("options"));
+    unfolder.def("is_rejection_sampling_set", &storm::pomdp::ObservationTraceUnfolder<ValueType>::isRejectionSamplingSet);
     unfolder.def("transform", &storm::pomdp::ObservationTraceUnfolder<ValueType>::transform, py::arg("trace"));
-    unfolder.def("extend", &storm::pomdp::ObservationTraceUnfolder<ValueType>::extend, py::arg("new_observation"));
+    unfolder.def("extend", &storm::pomdp::ObservationTraceUnfolder<ValueType>::extend, py::arg("new_observations"));
     unfolder.def("reset", &storm::pomdp::ObservationTraceUnfolder<ValueType>::reset, py::arg("new_observation"));
 }