diff --git a/Trekker.xcodeproj/project.pbxproj b/Trekker.xcodeproj/project.pbxproj
index ce497c6..7e99871 100644
--- a/Trekker.xcodeproj/project.pbxproj
+++ b/Trekker.xcodeproj/project.pbxproj
@@ -297,7 +297,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0710;
-				LastUpgradeCheck = 1120;
+				LastUpgradeCheck = 1200;
 				ORGANIZATIONNAME = "Rens Verhoeven";
 				TargetAttributes = {
 					0C7FAD091BECBE8C0049C011 = {
@@ -465,6 +465,7 @@
 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
@@ -489,7 +490,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.1;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
@@ -520,6 +521,7 @@
 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
@@ -538,7 +540,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.1;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
@@ -554,7 +556,7 @@
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				INFOPLIST_FILE = Example/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "co.awkward.trekker-example";
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -569,7 +571,7 @@
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				INFOPLIST_FILE = Example/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "co.awkward.trekker-example";
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -591,7 +593,7 @@
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
 				INFOPLIST_FILE = Trekker/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = co.awkward.trekker;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -617,7 +619,7 @@
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
 				INFOPLIST_FILE = Trekker/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = co.awkward.trekker;
 				PRODUCT_NAME = "$(TARGET_NAME)";
diff --git a/Trekker.xcodeproj/xcshareddata/xcschemes/Trekker.xcscheme b/Trekker.xcodeproj/xcshareddata/xcschemes/Trekker.xcscheme
index 99af7c8..0f97abb 100644
--- a/Trekker.xcodeproj/xcshareddata/xcschemes/Trekker.xcscheme
+++ b/Trekker.xcodeproj/xcshareddata/xcschemes/Trekker.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1130"
+   LastUpgradeVersion = "1200"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/Trekker.xcodeproj/xcshareddata/xcschemes/TrekkerExample.xcscheme b/Trekker.xcodeproj/xcshareddata/xcschemes/TrekkerExample.xcscheme
index d6af587..b91e6ec 100644
--- a/Trekker.xcodeproj/xcshareddata/xcschemes/TrekkerExample.xcscheme
+++ b/Trekker.xcodeproj/xcshareddata/xcschemes/TrekkerExample.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1130"
+   LastUpgradeVersion = "1200"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/Trekker/Trekker.swift b/Trekker/Trekker.swift
index da51833..461bb60 100644
--- a/Trekker/Trekker.swift
+++ b/Trekker/Trekker.swift
@@ -18,7 +18,7 @@ public final class Trekker: NSObject {
     
     //MARK: - Public configurable or readable variables
     
-    /// If the Trekker itself should handle sesstion state updates automaticlly.
+    /// If the Trekker itself should handle session state updates automatically.
     ///
     /// - important: If this is disbale, you are responsible to call the following methods yourself:
     /// - `func startTracking()`
@@ -71,6 +71,15 @@ public final class Trekker: NSObject {
             NotificationCenter.default.addObserver(self, selector: #selector(Trekker.endTracking(_:)), name: UIApplication.willTerminateNotification, object: nil)
         }
     }
+
+    /// Enables/disables tracking within all registered services.
+    /// This method can be used if Tracking is opt-in for legal reasons.
+    /// Each service should respect this setting individually using the optional `setTrackingEnabled(_:)` method.
+    ///
+    /// - Parameter enabled: Whether or not tracking should be enabled.
+    public func setTrackingEnabled(_ enabled: Bool) {
+        services.forEach { $0.setTrackingEnabled(enabled) }
+    }
     
     // MARK: - Session state
     
diff --git a/Trekker/TrekkerService.swift b/Trekker/TrekkerService.swift
index 8ed850f..76954e4 100644
--- a/Trekker/TrekkerService.swift
+++ b/Trekker/TrekkerService.swift
@@ -38,6 +38,9 @@ public protocol TrekkerService {
     
     /// Called when the Trekker has been stopped using `func stopTracking()`. Some services can use this to end a session.
     func stop()
+
+    /// Called when Tracking is opt-in to enable/disable tracking.
+    func setTrackingEnabled(_ enabled: Bool)
 }
 
 public extension TrekkerService {
@@ -57,4 +60,8 @@ public extension TrekkerService {
     func stop() {
         // Empty implementation to make the implementation optional.
     }
+
+    func setTrackingEnabled(_ enabled: Bool) {
+        // Empty implementation to make the implementation optional.
+    }
 }