You didn't added settings for twitter4j in proguard.  You should add below settings 

-dontwarn javax.management.**
-dontwarn java.lang.management.**
-dontwarn org.apache.log4j.**
-dontwarn org.apache.commons.logging.**
-dontwarn org.slf4j.**
-dontwarn org.json.*


and this:

-keep class javax.** { *; }
-keep class org.** { *; }
-keep class twitter4j.** { *; }


This will solve your issue

proguard exception while creating apk in ecllipse in android
I feel like I'm particularly bad at any kind of scene where I want to drop clues. I'm hesitant to use the term "crime scene" because it's not always being investigated by "police", and some of these times there isn't any kind of typical evidence.

I'm not even 100% sure that my problem is just the scene, but rather creating enough evidence to begin with. Other aspects I struggle with is witnesses - both witnesses with knowledge, and how to reveal it. Having useless witnesses for flavor, etc. I keep feeling that in general I give too little in these scenes, and everything I give is important.

Since I suspect this is a rather broad problem, I'd like to know if there are any Role Playing resources (sections of books, site, etc) that are specifically geared at teaching this portion of RPG storytelling?

I'm currently playing in the "new" World of Darkness 2.0, but I want answers on this not tied to the game system's rules.
