Answer: Andrews is stated as specifically going to New York in pursuit of Tumblety in the well sources & researched documentary cited. This programme is not a 'dubious source', & its point is reinforced by the rest of the Wiki article text where it states the speculation that was abound in the contemporary American press at the time as to Tumblety being linked to the crimes & supported by the quote in the text from the American authorities stating that they were unable to extradite as the only charges FT was formally sought for in England was the gay tryst & that wasn't enough. The suggestion that The Yard sent Andrews, a top detective with the force, across the Atlantic for any other reason ... or on some other "unknown matter" given these points taken together, is far fetched. 

If you want to put a compromise text in giving #1 Source says it's not known what he went for, & #2 The documentary cited says it was a pursuit, & this would appear to be supported by the speculation in the US press & the statement of refusal of extradition by the NY Police without a formal charge of an extraditable nature from Scotland Yard ..... fine with me.

1 more thing thing, altho I admire yr enthusiasm, if you'll chill out a little in yr editing of this article, & maybe allow others to make the contribution over a day or so & then come in once they've finished, say a couple of days later, it would be a better way of doing business. Whilst doing this edit I've found you leaping in often mid-edit when I was still assembling the text different points, counter-editing, & when I've then tried to review where I am I've lost my thread due to the intrusion .... & it just creates confusion.

Having said that, thx for yr edit of my entries into the source list combining all the individual refs to the tv documentary into 1, I wasn't sure how to do it. 

User:Bardrick