diff --git a/README.md b/README.md
index fc8ee07..c9ca466 100644
--- a/README.md
+++ b/README.md
@@ -68,11 +68,25 @@ All Resources that are supposed to be accessed via the facade have to be configu
 ```
 Resources:
   Observation:
+    EvaluationStrategy: "date"
     Date: "issued"
     Subject: "subject/reference"
   Encounter:
+    EvaluationStrategy: "date"
     Date: "period/start"
     Subject: "subject/reference"
+  Procedure:
+    EvaluationStrategy: "date"
+    Date: "performedPeriod/"
+    Subject: "subject/reference"
+  Specimen:
+    EvaluationStrategy: "date"
+    Date: "collection/collectedDateTime"
+    Subject: "subject/reference"
+  Patient:
+    EvaluationStrategy: "simple"
+    Date: ""
+    Subject: "id"
 ```
 
 ### Provision Configuration
diff --git a/facade_app/config/passthrough_config.yml b/facade_app/config/passthrough_config.yml
index 097171c..56cd31c 100644
--- a/facade_app/config/passthrough_config.yml
+++ b/facade_app/config/passthrough_config.yml
@@ -6,5 +6,4 @@ URLs:
   - "/test/echo"
 Resources:
   - "metadata"
-  - "Patient"
   - "Consent"
diff --git a/facade_app/config/resource_config.yml b/facade_app/config/resource_config.yml
index c58bfe6..17e95a1 100644
--- a/facade_app/config/resource_config.yml
+++ b/facade_app/config/resource_config.yml
@@ -1,17 +1,28 @@
 #Add all resources that are supposed to be limited by consent status
 #This must include a 'Date' Attribute with a relative Path from the Resource to a necessary Date field including its name
 #As well as a similar 'Subject' field with the relative Path to a necessary Patient Identifier
+#The 'EvaluationStrategy' can be either 'date' or 'simple', depending on whether the valid period of the configured provisions should be evaluated
+#In the case of 'simple', the valid period of the provisions is not evaluated and the consent is only checked for existence
+#Therefor the date field can be left empty
 #Paths are represented as follows: path/to/the/subject/field
 Resources:
   Observation:
+    EvaluationStrategy: "date"
     Date: "issued"
     Subject: "subject/reference"
   Encounter:
+    EvaluationStrategy: "date"
     Date: "period/start"
     Subject: "subject/reference"
   Procedure:
+    EvaluationStrategy: "date"
     Date: "performedPeriod/"
     Subject: "subject/reference"
   Specimen:
+    EvaluationStrategy: "date"
     Date: "collection/collectedDateTime"
     Subject: "subject/reference"
+  Patient:
+    EvaluationStrategy: "simple"
+    Date: ""
+    Subject: "id"
diff --git a/facade_app/resources/fhir_facade_server.py b/facade_app/resources/fhir_facade_server.py
index 0a5f05e..cea6bbc 100644
--- a/facade_app/resources/fhir_facade_server.py
+++ b/facade_app/resources/fhir_facade_server.py
@@ -70,8 +70,8 @@ def handleRequest(self, resource, search=""):
     # Check if resource has been configured properly
     if (
         RESOURCE_PATHS[resource]["Date"] == ""
-        or RESOURCE_PATHS[resource]["Subject"] == ""
-    ):
+        and RESOURCE_PATHS[resource]["EvaluationStrategy"] != "simple"
+    ) or RESOURCE_PATHS[resource]["Subject"] == "":
         return (
             f"The requested resource has not been configured. Please add the necessary configuration. Or if you dont require consent for the requested resources, use the fhir-server endpoint ({SERVER_URL}) directly.",
             403,
diff --git a/facade_app/util/consentAndResourceUtil.py b/facade_app/util/consentAndResourceUtil.py
index a617a2d..9d6eb9e 100644
--- a/facade_app/util/consentAndResourceUtil.py
+++ b/facade_app/util/consentAndResourceUtil.py
@@ -136,32 +136,43 @@ def matchResourcesWithConsents(resources, consents, resource_config, provision_c
         subject = res["resource"]
         for path in resource_config["Subject"].split("/"):
             subject = subject[path]
-
-        date = res["resource"]
-        for path in resource_config["Date"].split("/"):
-            date = date[path]
-        date = parser.parse(date)
+        if (
+            not subject.startswith("Patient/")
+            and len(resource_config["Subject"].split("/")) == 1
+        ):
+            subject = "Patient/" + subject
+
+        if resource_config["EvaluationStrategy"] == "date":
+            date = res["resource"]
+            for path in resource_config["Date"].split("/"):
+                date = date[path]
+            date = parser.parse(date)
 
         if subject in provision_time_set:
 
-            for provision in provision_time_set[subject]:
-
-                start = parser.parse(provision["period"]["start"])
-                end = parser.parse(provision["period"]["end"])
-
-                if provision["type"] == "permit":
-                    if (
-                        date.timestamp() >= start.timestamp()
-                        and date.timestamp() <= end.timestamp()
-                    ):
-                        is_consented = True
-                else:
-                    if (
-                        date.timestamp() >= start.timestamp()
-                        and date.timestamp() <= end.timestamp()
-                    ):
-                        is_consented = False
-                        break
+            if resource_config["EvaluationStrategy"] == "date":
+
+                for provision in provision_time_set[subject]:
+
+                    start = parser.parse(provision["period"]["start"])
+                    end = parser.parse(provision["period"]["end"])
+
+                    if provision["type"] == "permit":
+                        if (
+                            date.timestamp() >= start.timestamp()
+                            and date.timestamp() <= end.timestamp()
+                        ):
+                            is_consented = True
+                    else:
+                        if (
+                            date.timestamp() >= start.timestamp()
+                            and date.timestamp() <= end.timestamp()
+                        ):
+                            is_consented = False
+                            break
+
+            if resource_config["EvaluationStrategy"] == "simple":
+                is_consented = True
 
             for prov_code in provision_config["coding"]:
                 provision_exists = False